title: How does this remove the multindex and make the year column the index instead?
body: <p>I was watching a tutorial with a dataframe which has a multindex</p>
  <p>It was this
  <img src="https://i.stack.imgur.com/JkKM8.png" alt="It was this" /></p>
  <p>They then typed in this to remove it:</p>
  <pre><code>data.index_col = 0
  data.skiprows = 1
  </code></pre>
  <p>It became this
  <img src="https://i.stack.imgur.com/gbhAH.png" alt="It became this" /></p>
  <p>That turned the year column into the index, and turned the others into columns.
  I was wondering how it did that?</p>