title: Making a regression line through a bar char using pandas or seaborn
body: <p>I am new to Pandas and Seaborn and trying to learn. I am trying to add a trend line and a bar plot on the same graph. I have some data that looks like</p>
  
  <pre><code>Year     Sample Size
   2000      500
   2001      3000
   2003      10000
   2004      20000
   2004      23000
  </code></pre>
  
  <p>I am new to pandas and seaborn and I am attempting to draw a line through the bar plot showing a decreasing or an increasing trend but struggling to do it on the same graph. Till now, I have a bar plot. Below you can find the code. </p>
  
  <p>sampleSizes['Sample Size'] -> is the column I am plotting. It has about 12 values for 12 years.</p>
  
  <pre><code>plt.figure()
  ax = sampleSizes['Sample Size'].plot(kind='bar', title="Trend of Sample Sizes", figsize=(15, 10), legend=True, color = 'grey', fontsize=8)
  plt.show()
  </code></pre>
  
  <p>I am struggling to add a trend line to this. I would be grateful if someone could point me in the right direction.</p>
  
  <p>UPDATE</p>
  
  <pre><code>FinancialYear  Sample Size
     2001         2338
     2002         3171
     2003         2597
     2004         2740
     2005         3447
     2006         3098
     2007         2610
     2008         2819
     2009         2057
     2010         2174
     2011         2709
  
  enter code here
  </code></pre>