My Google Adsense income is going up

I was pleasantly surprised this past week when each day I have been earning at least $1 abovie my normal daily earnings from clicks. The thing is, I have not done anything different to any of my blogs other than write in them. I think that I am getting the same number of visitors, it is just that the price per clicks have risen. I sure do hope that the trend still stays on track and it is not a fluke of some kind.