text: Title: What does the right Y axis ticks in missingno represent?
  Body: According to the example run by the author in the docs, I thought Y axis represented the number of entries according to the percentage in the right Y axis. However, values are way discrepant in my case:
  
  ![screenshot_20180717_094403](https://user-images.githubusercontent.com/13151704/42817974-093674f0-89a6-11e8-92a8-b6dd2203ac37.png)
  
  Could anyone explain what the right Y axis ticks really represent?
  