Someone

digraph test {

	graph [ranksep="0.2", nodesep="0.1", ratio=fill];

	node [label="\N", fixedsize=true, fontsize=9, shape=circle];

	edge [arrowhead=none, arrowsize="0.6", arrowtail=normal];

	{

		graph [rank=same];

		y1993 [label=1993, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1993, width="0.398147893333333"];

		n128 [label=129, height="0.386309065228285", rank=1993, width="0.386309065228285", URL=128];

	}

	{

		graph [rank=same];

		y1987 [label=1987, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1987, width="0.398147893333333"];

		n48 [label=49, height="0.303045763365663", rank=1987, width="0.303045763365663", URL=48];

	}

	{

		graph [rank=same];

		y1981 [label=1981, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1981, width="0.398147893333333"];

		n26 [label=27, height="0.479157423749955", rank=1981, width="0.479157423749955", URL=26];

		n23 [label=24, height="0.28347335475692", rank=1981, width="0.28347335475692", URL=23];

	}

	{

		graph [rank=same];

		y1975 [label=1975, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1975, width="0.398147893333333"];

		n4 [label=5, height="0.386309065228285", rank=1975, width="0.386309065228285", URL=4];

		n5 [label=6, height="0.546323519313513", rank=1975, width="0.546323519313513", URL=5];

	}

	{

		graph [rank=same];

		y1994 [label=1994, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1994, width="0.398147893333333"];

		n134 [label=135, height="0.303045763365663", rank=1994, width="0.303045763365663", URL=134];

	}

	{

		graph [rank=same];

		y1989 [label=1989, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1989, width="0.398147893333333"];

		n56 [label=57, height="0.576981943621554", rank=1989, width="0.576981943621554", URL=56];

		n52 [label=53, height="0.28347335475692", rank=1989, width="0.28347335475692", URL=52];

	}

	{

		graph [rank=same];

		y2001 [label=2001, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=2001, width="0.398147893333333"];

		n391 [label=392, height="0.303045763365663", rank=2001, width="0.303045763365663", URL=391];

		n359 [label=360, height="0.321428571428571", rank=2001, width="0.321428571428571", URL=359];

		n355 [label=356, height="0.321428571428571", rank=2001, width="0.321428571428571", URL=355];

	}

	{

		graph [rank=same];

		y1990 [label=1990, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1990, width="0.398147893333333"];

		n61 [label=62, height="0.28347335475692", rank=1990, width="0.28347335475692", URL=61];

	}

	{

		graph [rank=same];

		y1997 [label=1997, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1997, width="0.398147893333333"];

		n225 [label=226, height="0.338815463589469", rank=1997, width="0.338815463589469", URL=225];

		n207 [label=208, height="0.321428571428571", rank=1997, width="0.321428571428571", URL=207];

		n212 [label=213, height="0.386309065228285", rank=1997, width="0.386309065228285", URL=212];

	}

	{

		graph [rank=same];

		y1979 [label=1979, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1979, width="0.398147893333333"];

		n14 [label=15, height="0.386309065228285", rank=1979, width="0.386309065228285", URL=14];

	}

	{

		graph [rank=same];

		y1991 [label=1991, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1991, width="0.398147893333333"];

		n70 [label=71, height="0.303045763365663", rank=1991, width="0.303045763365663", URL=70];

		n65 [label=66, height="0.355352656109507", rank=1991, width="0.355352656109507", URL=65];

		n66 [label=67, height="0.28347335475692", rank=1991, width="0.28347335475692", URL=66];

	}

	{

		graph [rank=same];

		y1985 [label=1985, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1985, width="0.398147893333333"];

		n42 [label=43, height="0.28347335475692", rank=1985, width="0.28347335475692", URL=42];

	}

	{

		graph [rank=same];

		y1998 [label=1998, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1998, width="0.398147893333333"];

		n243 [label=244, height="0.386309065228285", rank=1998, width="0.386309065228285", URL=243];

	}

	{

		graph [rank=same];

		y1992 [label=1992, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1992, width="0.398147893333333"];

		n102 [label=103, height="0.386309065228285", rank=1992, width="0.386309065228285", URL=102];

	}

	{

		graph [rank=same];

		y1977 [label=1977, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1977, width="0.398147893333333"];

		n7 [label=8, height="0.303045763365663", rank=1977, width="0.303045763365663", URL=7];

		n10 [label=11, height="0.28347335475692", rank=1977, width="0.28347335475692", URL=10];

	}

	{

		graph [rank=same];

		y1972 [label=1972, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1972, width="0.398147893333333"];

		n0 [label=1, height="0.75", rank=1972, width="0.75", URL=0];

	}

	{

		graph [rank=same];

		y1986 [label=1986, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1986, width="0.398147893333333"];

		n44 [label=45, height="0.321428571428571", rank=1986, width="0.321428571428571", URL=44];

	}

	{

		graph [rank=same];

		y1996 [label=1996, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1996, width="0.398147893333333"];

		n190 [label=191, height="0.321428571428571", rank=1996, width="0.321428571428571", URL=190];

		n192 [label=193, height="0.355352656109507", rank=1996, width="0.355352656109507", URL=192];

	}

	{

		graph [rank=same];

		y1999 [label=1999, fontsize=10, shape=plaintext, height="0.139", margin=0, rank=1999, width="0.398147893333333"];

		n300 [label=301, height="0.338815463589469", rank=1999, width="0.338815463589469", URL=300];

	}

	n0 -> n134;

	n0 -> n212;

	n0 -> n26;

	n0 -> n7;

	n10 -> n56;

	n102 -> n134;

	n102 -> n212;

	n128 -> n190;

	n134 -> n212;

	n14 -> n61;

	n225 -> n359;

	n225 -> n391;

	n23 -> n243;

	n23 -> n26;

	n26 -> n128;

	n26 -> n243;

	n26 -> n56;

	n355 -> n391;

	n359 -> n391;

	n4 -> n14;

	n4 -> n190;

	n42 -> n128;

	n42 -> n243;

	n44 -> n61;

	n5 -> n10;

	n5 -> n128;

	n5 -> n26;

	n5 -> n48;

	n5 -> n56;

	n5 -> n70;

	n56 -> n102;

	n56 -> n128;

	n56 -> n134;

	n56 -> n190;

	n56 -> n212;

	n56 -> n355;

	n65 -> n300;

	n66 -> n300;

	n70 -> n128;

	n70 -> n190;

	y1972 -> y1975 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1975 -> y1977 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1977 -> y1979 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1979 -> y1981 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1981 -> y1985 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1985 -> y1986 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1986 -> y1987 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1987 -> y1989 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1989 -> y1990 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1990 -> y1991 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1991 -> y1992 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1992 -> y1993 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1993 -> y1994 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1994 -> y1996 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1996 -> y1997 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1997 -> y1998 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1998 -> y1999 [arrowhead=normal, arrowtail=none, color=white, style=invis];

	y1999 -> y2001 [arrowhead=normal, arrowtail=none, color=white, style=invis];

}