pan class="r-out co"><span class="r-pr">#&gt;</span>         date state      y</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 1 1973-01-01  U.S. 843900</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 2 1973-02-01  U.S. 747331</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 3 1973-03-01  U.S. 648504</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 4 1973-04-01  U.S. 465867</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 5 1973-05-01  U.S. 