title: multiple boxplots by date in index
body: <p>My dataframe </p>
  
  <pre><code>index   Dates        Hours_played
  0       2014-11-06   11
  1       2014-12-06   4
  2       2015-09-06   5
  3       2015-97-06   5
  </code></pre>
  
  <p>Then, I set Dates as index:</p>
  
  <pre><code>             Hours_played
  Dates        
  2014-11-06   11
  2014-12-06   4
  2015-09-06   5
  2015-97-06   5
  </code></pre>
  
  <p><strong>The Problem:</strong>  When I tried to create one box plot for each year found in index, I got both plots on the same grid.</p>
  
  <pre><code>df.loc['2014']['Hours_played'].plot.box(ylim=(0,200))
  df.loc['2015']['Hours_played'].plot.box(ylim=(0,200))
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/6SpNh.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6SpNh.png" alt="Box plot"></a> </p>
  
  <p>I tried the following but the plot comes up empty:</p>
  
  <pre><code>data_2015 = df.loc['2015']['Hours_played']
  data_2016 = df.loc['2016']['Hours_played']
  data_to_plot = [data_2015, data_2016]
  
  mpl_fig = plt.figure()
  ax = mpl_fig.add_subplot(111)
  ax.boxplot(data_to_plot)
  ax.set_ylim(0,300)
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/XxavO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XxavO.png" alt="boxplot2"></a></p>
  
  <p><strong>Is it possible to have them in the same grid, one by the other?</strong></p>