15 to 50%!! sounds like there is not one common %.....i have lived in the same house for 4 years, with 2 2year contracts. I pay for six months at a time, all at once. the past contracts increased 20 to 25 percent each 6 months. I am getting ready to negotiate a new contract for 2 years. perry, by "stipulated" do you mean that there is a law of 15%, or a normal practice? (that would be great but I am probably wishfully dreaming)