I would say "back in the day," there were maybe 2-3 great games a year. I've been in the hobby since 2011, and the number of games per year goes up pretty dramatically, until I petered off a little bit as I finally started to curtail my spending. Some games that are included here are on the chopping block, so the numbers would probably be further skewed towards newer stuff if I took those out of my BGG collection.
2000: 1
2005: 1
2006: 1
2007: 2
2008: 2
2009: 3
2010: 3
2011: 9
2012: 7
2013: 11
2014: 11
2015: 20
2016: 11
2017: 15
2018: 7