here is a better thing do to see how many competitors there are for your keyword, and how many impressions you are getting. if you are in position 1-8 there can be a lot of reasons you are getting low impressions, not the least of which is that there simply are not that many searches for your word, but can also be your daily budget limit is severly limiting your amount of impressions. if you have $1 bid, and a daily budget of $5 then your impressions will be very very low, keep that in mind.
i try to keep my daily budget approximately 10 times what my actual budget is, then check it a lot the first few days, and adjust as needed.
thats just me though.