<page_title> World population milestones </page_title> <table> <cell> 2 <col_header> World population milestones in billions </col_header> <row_header> Population </row_header> <row_header> 1 </row_header> </cell> <cell> 1927 <col_header> World population milestones in billions </col_header> <col_header> 2 </col_header> <row_header> Year </row_header> </cell> <cell> 123 <col_header> World population milestones in billions </col_header> <col_header> 2 </col_header> <row_header> Years elapsed </row_header> </cell> </table>
World population took 123 years to reach two billion in 1927.