Hannah Oc has seen concerts during 13 years.

Year   Concerts Seen  
2023 1 concert
2017 1 concert
2016 2 concerts
2013 1 concert
2010 2 concerts
2009 2 concerts
2008 1 concert
2007 4 concerts
2006 4 concerts
2005 2 concerts
2004 1 concert
2001 1 concert
1999 1 concert