Major League Soccer celebrated its 20th season in 2015. Once an afterthought among America's professional sports leagues, soccer's surge in popularity can be seen in the ever-increasing attendance and expansion in MLS.

With the 2015 MLS Playoffs underway we figured that it was a good time to look back at the average attendance from the regular season. Also, here are the attendance trends among all MLS teams over the last 3 seasons.