for me its...
2011 : the year when i started to stan KPOP. Bubble Pop,Roly Poly,The Boys,Mr Simple,Fiction,Trouble Maker,Step,Hot Summer... oh good old days tho
2014 : girl group domination when we have snsd,2ne1,apink,sistar,girls day,aoa,orange caramel,t-ara,kara,secret and many more . Also BEAST and EXO producing bops (im a huge beast fans).
2016 : the beginning of 3rd gen domination . Cheer Up , Rough , BST , Monster etc . So many bops released . Also IOI and BLACKPINK debuted on that year. 2nd gen also still producing bops like WG,Beast,SISTAR and AOA.
2018 : the peak of 3rd gen . So many bops and hit song released during that year
OVERALL : 2016 is the best year imo .