All data obtained from @SonOfTheBronx on Twitter:
Son Of The Bronx/Programming Insider

April 1st, 2017 (Rick and Morty April’s Fool Night)

Time
Show
Ratings
A18-49
11:00am Rick and Morty 949,000 564,000
11:30am Rick and Morty 818,000 505,000
12:00am DBZ Kai 864,000 511,000
12:25am Sand Whale and Me 826,000 520,000
12:30am Jojo’s Bizarre Adventure 679,000 416,000
1:00am Tokyo Ghoul 601,000 368,000
1:30am Hunter X Hunter 593,000 372,000
2:00am Gundam Unicorn 548,000 352,000
2:30am Naruto: Shippuden 583,000 359,000
3:00am Ghost in the Shell 492,000 326,000


comparison

April 2nd, 2016 

Time
Show
Ratings
A18-49
11:00am Family Guy 1,747,000 997,746
11:30am Family Guy 1,778,000 997,746
12:00am DBZ Kai 1,371,000 793,000
12:30am Dimension W 1,067,000 659,000
1:00am Parasyte 940,000 567,000
1:30am Samurai Champloo 886,000 528,000
2:00am Naruto:Shippuden 905,000 545,000
2:30am One Piece 775,000 445,000
3:00am Kill La Kill 748,000 405,000

If you want more data, you can check my spreadsheet here. That will have further data including per year difference and A18-49 differences.

Let us know what you think in the comments below about the ratin