Well, the first year I started cosplaying (2010) I went to 2 cons. 2011 I went to 4 cons and this year I've been to 9 cons so far and there will be a 10th on November. So yeah, the number has been growing every year. XD I didn't count mini manga days (read: 4 hour events) because I've been to maybe one or two of those each year.
I don't believe I can go to 10 cons next year though.. haha.