[Plugin: WP SlimStat] When filtering by year, graph does't show month on x axle

I am filtering by year to create some reports. When I do that you can see the amount of pages visited and unique IPs, but the months are not shown in graph so it is hard to read in what month there were visitor peaks or dips. Is there a way to remedy this?

http://wordpress.org/extend/plugins/wp-slimstat/