Najohnson has seen concerts during 13 years.

Year   Concerts Seen  
2020 1 concert
2019 9 concerts
2018 5 concerts
2017 5 concerts
2016 3 concerts
2014 1 concert
2013 1 concert
2011 1 concert
2010 1 concert
2009 2 concerts
2004 2 concerts
1999 1 concert
1998 1 concert