title: Accessing values in nested dictionary
body: <p>Nested dictionary has a length of 12, this is one of the records:</p>
  
  <pre><code>{('ALEXANDER', 'MALE'): {'2010': ('2619', None), '2011': ('2494', None), '2009': ('2905', None)}, ...
  </code></pre>
  
  <p>Main key = <code>('ALEXANDER', 'MALE')</code></p>
  
  <p>Main value (which is nested dictionary) = <code>{'2010': ('2619', None), '2011': ('2494', None), '2009': ('2905', None)}</code></p>
  
  <p>Nested dictionary key/value = <code>'2010': ('2619', None)</code> ...</p>
  
  <p>How would one access the year <code>'2010'</code> and the value <code>'2619'</code>?</p>
  
  <p>Is it possible to do this using variables?</p>