Similar to many other places (and the following is just for stays I have booked this year):
London 20%
Athens 14.43%
Rome 12.7%
Blue Springs, MO 16.12%
New Paris, OH 13.25%
Buenos Aires 21%
LAX 22.2%
BTW, to the OP: my guess is you've experienced this before, just not by this amount of increase so it has gone by unoticed. Quite often the rates I have booked (with taxes) end up being a bit more when I actually stay as the tax rate has increased from 5.6% to 5.8%, or 15.12% to 16.12% and in the case of short stays this may be a 50¢, $1 or $2 difference on the final bill and go unoticed. This happens to me at least a couple times a year, but then again I book my rooms 50 weeks in advance so there is plenty of time for tax changes to occur.