Allianz Car Insurance extremely increased

hello people, I wanted to ask you something, although I have 3 cars insured with the alliance. I received today the new documents or notification of the insurance consumers for the coming year 2012. I must say, all 3 cars have “extremely” increased, OBWOHL did not have an accident or damage regulation, and it has nothing to do with the one step, because I have looked on the internet page, 2 cars have even fallen by one level, the other has remained the same. can I explain this to myself? there are no price differences of 10-50€, but from 100€ to 190€ following sf have I sf15 sf 6 and sf 4 is it also so with you? with the alliance or also with another insurance?