How often do you clean out your wood stove chimney?

I have the steel insulated chimney and last year I cleaned it out about 4 times during the burning season, late October to end of March. This year, I just did it on Jan 3rd or so and I don't plan on doing it again until April 1st. I burn nice dry wood so I am not too concerned about creosote buildup. In fact when I did clean it out, it is always crispy black built up on the inner walls of the pipe. How often do you do yours?