All data obtained from @SonOfTheBronx on Twitter:
Son Of The Bronx/Programming Insider
Oct 28th, 2017 (Samurai Jack S5 Marathon)
Oct 29th, 2016 (IBO Marathon)
If you want more data, you can check my spreadsheet here. That will have further data including per year difference and A18-49 differences. Any mistakes can be notified on my twitter @AmbientVirus
Let us know what you think in the comments below about the ratings.