Untitled

<style>
thead {
  background:#70a82d url('/static/images/image.png') left top repeat-x;
}
<style

<table cellpadding="0" cellspacing="0" style="width: 90%" border="1">
  <thead align="center">
    <tr>
      <th rowspan="3">Всего</th>
      <th colspan="5">Число</th>
      <th colspan="5">Численность<th>
    </tr>
  </thead>
<blabla>
</table>