Sudden Increase and Decrease on Google Indexing

For a week my google indexed pages go down from 305.000 to 77.000 and yesterday it goes up to 219.000 for few hours and now it is just 16.500 pages.

Nothing wrong with the sitemaps no error on vbseo. Everything seems to be normal...

Please let me have your comments what can be the problem? Why I see such big flactuations?

Thanks in advance.

site:domaim.com query is not accurate. You shall not take that as a reference. You shall track your statistics with an stat program like Google Analytics

Thanks Mert.
Teşekkürler Mert Hocam.

Hi again. Even site:domaim.com query is not accurate. Before I have vbseo installed I have around 303.000 pages index in google. Now it is 27.500 and it is the same for 1 week.

After the installation of the vbseo my page rank in Number 1 Forum - Kaliteli Payla??m Forumunuz increased from 0 to 1. I am very glad about it. But the google index makes me worry a little. Also extreme tracker shows a decrease of 1000 hits per day for a week.

I also add the spider activity of yesterday for your comments...

Please let me have you comments accordingly.