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

Jan 20th, 2018

Time
Show
Ratings
A18-49
10:30am Dragon Ball Super 1,068,000 658,000
11:00am DBZ Kai 844,000 507,000
11:30am Black Clover 626,000 374,000
12:00am Jojo’s Bizarre Adventure 540,000 338,000
12:30am Gundam IBO 502,000 319,000
1:00am Hunter X Hunter 487,000 315,000
1:30am Lupin The 3rd 419,000 285,000
2:00am Naruto Shippuden 427,000 287,000
2:30am Outlaw Star 396,000 261,000
3:00am Cowboy Bebop 434,000 274,000
3:00am Ghost In The Shell 383,000 250,000

;
comparison

Jan 21th, 2017

Time
Show
Ratings
A18-49
11:30am Dragon Ball Super 1,041,000 588,000
12:00am DBZ Kai 925,000 550,000
12:30am Jojo’s Bizarre Adventure 760,000 437,000
1:00am Gundam IBO 648,000 386,000
1:30am Hunter X Hunter 618,000 369,000
2:00am Naruto: Shippuden 520,000 313,000
2:30am One Piece 450,000 274,000
3:00am One Punch Man 498,000 310,000

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.