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

Mar 31th, 2018 (April’s Fools) 

Time
Show
Ratings
A18-49
10:30am Dragon Ball Super 997,000 568,000
11:00am DBZ Kai 881,000 522,000
11:30am Black Clover 647,000 389,000
12:00am Fooly Cooly 521,000 305,000
12:30am Mind Game 381,000 229,000
2:45am Jojo’s Bizarre Adventure 324,000 199,000
3:15am Hunter X Hunter 326,000 213,000
3:45am Naruto Shippuden 305,000 204,000
4:15am Space Dandy 319,000 209,000
4:45am Cowboy Bebop 300,000 201,000
5:15am Ghost In The Shell 287,000 186,000
5:45am Scavengers 278,000 174,000

;
comparison

April 1st, 2017

Time
Show
Ratings
A18-49
12:00am DBZ Kai 864,000 511,000
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

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 ratings.