10% rise over 10 years
When I moved into my current home just over 10 years ago we paid £30 a month. We've not added anything but an addition box when we kept the V+ box when they forced us to move to a tivo. They've added a few channels that we don't watch and increased the broadband speed (nothing we asked for).
10 years later the monthly bill for the package was £76 (sans additional extras like phone calls, etc.), I think that works out around 11% per year. I say 'was', as soon as I found out about another price increase I went phoned and went switched to the basic package and they gave me £60 credit towards the price increase.
That last above inflation rise was enough to motivate me to doing something I've been meaning to do for ages and has cost them about £480 form me for the next year.