Googlebot stops indexing my site for more than 8 months!

Sample from webserver log file.

[Zaid]

Although googlebot still visits my site but is stop indexing it for more than 8 months!
The following is line from my web server log where it is show that googlebot visits my site:

---------------------------------------------------------------------------

2005-10-05 00:50:08 W3SVC13145 C24403_51187 67.19.193.66 GET /mypage.asp id=16599 80 - 66.249.65.135 HTTP/1.1 Mozilla/5.0+(compatible;+Googlebot/2.1;++http://www.google.com/bot.html) - - wwWebmasterWorldebsite.com 200 0 0 17495 256 421
---------------------------------------------

Please help!