Every Season of Anime in the Past Decade (2010-2019), By the Numbers anitay.kinja.com

If you have a specific season you are interested in, feel free to just search for the season (“Season 201x”).
(399,922), A Certain Magical Index II (293,613), Yosuga no Sora (284,482)AdvertisementHighest QAR Season: Spring 2010Most 9.0+ Season: NoneMost 8.0-8.99 Season: Spring 2010Most 7.0-7.99 Season: Fall 2010Top Five Most Popular of 2010: Angel Beats!
Shokugeki no Soma (8.47), Ace of Diamond: Second Season (8.38), Fate/stay night: Unlimited Blade Works 2nd Season (8.37), My Teen Romantic Comedy SNAFU TOO!
Euphonium 2 (8.30), Bungou Stray Dogs 2nd Season (8.27), Mobile Suit Gundam: Iron-Blooded Orphans 2nd Season (8.27), Yuri!!!
The Third Plate (411,832), Blend S (291,765), Inuyashiki: Last Hero (288,045)AdvertisementHighest QAR Season: Fall 2017Most 9.0+ Season: Fall 2017Most 8.0-8.99 Season: TIE- Winter & Fall 2017Most 7.0-7.99 Season: Fall 2017Top Five Most Popular of 2017: My Hero Academia Season 2 (988,118), Attack on Titan 2nd Season (952,093), KonoSuba: God’s Blessing on This Wonderful World!