title: Pandas count unique value and change to percentage and put into the plotly bar chart
body: <p>I have a pandas dataframe which looks like this:</p>
  
  <pre><code>Country  
   Japan   
   Japan   
   Korea   
   India   
   India   
    USA    
    USA    
    USA   
  </code></pre>
  
  <p>I need to count the unique values of the country column and change to percentage and need to put in the x-axis and y-axis of plotly bar chart. Can anyone teach me how to do it?</p>