an><span class="va">Country</span>, <span class="va">Year</span>, <span class="va">eta</span><span class="op">)</span></span>
<span></span>
<span><span class="va">Etas</span><span class="op">$</span><span class="va">eta</span><span class="op">[[</span><span class="fl">1</span><span class="op">]</span><span class="op">]</span></span>
<span><span class="co">#&gt;                         eta</span></span>
<span><span class="co">#&gt; Crude dist.       0.9884332</span></span>
<span><span class="co">#&gt; Diesel