Yandex: Do good sites

I have now a web site, the schedule of monthly transitions from Yandex:.

But The weekly schedule.

Every three months, Yandex throws the whole city from the index portal with a five-year history. Sometimes AGS- um. Then he himself and returns. The index is 10 thousand. Then 32tys. Then 60tys. Then 89tys. page. And then, Whack, and 0 or 1. Nothing to do not do. Nothing on my site all the five years. Just continue to add news and dull.

UPD. Hoho. Not only in the index returns, but also gave a frightened 11 largest RF ( city name). Yandex - the best search engine of Russia! .