Yeah, £4.50 for card, £15 for instalments last year, so pretty much no change. I guess you guys must have paid cash. http://www.hullcityafc.net/staticFiles/fd/70/0,,10338~159997,00.pdf
Likewise, pay rise for me in that time though = -66% (admittedly through choice, and I might get that down to less than 50% with the work I'm doing over the summer) Season ticket when we were in D3 (2002/03) was about £270 for the same seat for an adult (give or take £5 or £10 because I'm working on a student price and the amount I had to pay to upgrade the 3 year ticket for a year or two at the end). Working from there, the inflation over that time is equal to 3.9% a year. That should probably get some adjustment to it since we're now 2 divisions higher.
5% of the increase is because of the vat catch up. Last season the price was frozen, but the net figure earned by the club was reduced. The club was losing 50k for every match played at the KC and something has had to be done. Supporters complained that the atmosphere in the KC is sometimes flat, now we have the club responding. I asked before what would supporters want the club to do to improve the match day experience, it looks like we are getting there.
