title: Get proportion of missing values per Country
body: <p><a href="https://i.stack.imgur.com/sZka0.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/sZka0.png" alt="enter image description here" /></a></p>
  <p>I would like to find the proportion of missing values of my features on each country and on all years to select the countries.</p>
  <p>I tried this:</p>
  <pre><code>df[indicators].isna().mean().sort_values(ascending=False)
  </code></pre>
  <p>but it gives me the proportion of missing values for each indicator only...</p>
  <p>i would like this output :</p>
  <p><a href="https://i.stack.imgur.com/Ihsly.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ihsly.png" alt="enter image description here" /></a></p>