The average cost of insurance has been drifting down, so I think we're roughly at the bottom (people are starting to warn of price rises in the pipeline).
Therefore it's a fallacy to assume that they (for whatever value of 'they') aren't ripping you off by keeping prices stable. It's like commending British Gas for keeping prices level when the wholesale cost of gas has gone down by 20%.
Last year my quote was the roughly same as the previous year, but I was still able to save 25% by shopping around.
Theo