0  Oil refineries    0.892</span></span>
<span><span class="co">#&gt; <span style="color: #BCBCBC;">8</span> GB      2000  Petrol dist.      0.972</span></span>
<span><span class="co">#&gt; <span style="color: #BCBCBC;">9</span> GB      2000  Power plants      0.398</span></span></code></pre></div>
<p><code>etas_forgraphing</code> is a data frame of efficiencies, one
for each Country, Year, and Industry, in a format that is amenable to
plotting with packages such as <a href="https://ggplot2.tidyverse.org" c