    NA          NA                 NA</span></span>
<span><span class="co">#&gt; 29            NA           NA          NA                 NA</span></span>
<span><span class="co">#&gt; 30            NA           NA          NA                 NA</span></span>
<span><span class="co">#&gt; 31            NA           NA          NA                 NA</span></span>
<span><span class="co">#&gt; 32            NA           NA          NA                 NA</span></span>
<span><span class="co">#&gt; 33            N