Year over year increases every year since I've began dablling in this industry.... it's kinda fun to be honest
The kids like to look at "Oh noes my sales are down since yesterday!" - I prefer to look at year over year results and compare, and well... no problems looking at April 2007 vs April 2008. In all business there is fluctuations - look at a monthly trend analysis instead of worrying about your beer money every weekend and you'll be fine