<table summary="This table shows the percentage of the United States population that lived in urban and rural areas from 1800 to 2000.">
   <caption>United States Urban and Rural Populations   </caption>
   <thead>
     <tr>
       <th>Year       </th>
       <th>Percent Urban       </th>
       <th>Percent Rural       </th>     </tr>   </thead>
   <tfoot>
     <tr>
       <td colspan="3">Data from
         <a href="http://www.census.gov/">United States Census Bureau         </a>       </td>     </tr>   </tfoot>
   <tbody>
     <tr>
       <th>2010       </th>
       <td>80.3       </td>
       <td>19.7       </td>     </tr>
     <tr>
       <th>2000       </th>
       <td>79.2       </td>
       <td>20.8       </td>     </tr>
     <tr>
       <th>1950       </th>
       <td>64.0       </td>
       <td>36.0       </td>     </tr>
     <tr>
       <th>1900       </th>
       <td>39.6       </td>
       <td>60.4       </td>     </tr>
     <tr>
       <th>1850       </th>
       <td>15.4       </td>
       <td>84.6       </td>     </tr>
     <tr>
       <th>1800       </th>
       <td>6.1       </td>
       <td>93.9       </td>     </tr>   </tbody>
 </table>