Mark Erickson has seen concerts during 12 years.

Year   Concerts Seen  
2019 1 concert
2018 4 concerts
2017 2 concerts
2016 1 concert
2015 2 concerts
2014 2 concerts
2013 1 concert
2012 1 concert
2011 1 concert
2007 1 concert
2004 1 concert
1970 1 concert