title: How can I split a dataframe into odd and even years?
body: <p>I have a dataframe of this format:</p>
  
  <pre><code>    19620101    1   2   4
      19630102    6   2   3
      19640103    0   2   3
      19650104    0   1   3
  </code></pre>
  
  <p>I want to split and store it into two variables/dataframes based on whether the year is even or odd.</p>
  
  <p>So basically, one dataframe/variable will have even years</p>
  
  <pre><code>    19620101    1   2   4
      19640103    0   2   3
  </code></pre>
  
  <p>While another will have odd years:</p>
  
  <pre><code>    19630102    6   2   3
      19650104    0   1   3
  </code></pre>
  
  <p>How can I do this?</p>