Indexed pages are declining

The pages are indexed by (14.01.2008) 25,000 to (17.02.2008) 16,300 fallen. ( http://www.google.de/search?hl=de&q=...le-Suche&meta= )The advertising revenue (google-adsense) are also around $ 10-15 per day declined.
A Sitemap is installed.
The average visitor from approximately 6,000 to 3,883 declined. Although most visitors came about google. What is the reason?

Martin

What stats package do you use, Google Analytics?

Have you identified any keywords that you have dropped for? If so, please post them so I can do a bit of an analysis.

Thank you:

Originally Posted by Joe Ward

What stats package do you use, Google Analytics?

it is Google-Analytic

Have you identified any keywords that you have dropped for? If so, please post them so I can do a bit of an analysis.

These are the keywords:
ALG II, erwerbslos, arbeitslos, hartz IV, Forum, Sozialhilfe, Sozialamt, Arbeitslosigkeit, Arbeitsamt, Grundsicherung, Obdachlosigkeit, Wohnungslosigkeit, Armut, Initiative, Großdemo, 03.06.bundesweite Demo, Berlin, Bonn, Deutschland, Sozialpolitik, soziale Bewegung

Setting the date range to 1 month prior to vBSEO installation, and 1 month afterwards, do you see a significant delay in these particular terms?

In December 2007, we were with the keywords: ALG II, erwerbslos, arbeitslos, hartz IV
Always on the first 2 pages of google. The page-rank is from 3 to 4 fallen.
Martin

Please open a request for review in our critique forum, and we will do a more detailed check of your forum.