On Princess, the fuel surcharge is in the cabin price.
It depends on when the fuel is purchased. They don't buy it on the spot market, but rather purchase it in mass quantities months in advance.
Southwest hedged on fuel a few years ago and bought it years out. That is the reason you don't see this on Southwest and also the checked baggage fees.
SS Norway (12 times) '85 - '97; Radiance OS 06/01; Island Princess 11/04, Grand Princess 11/04/05, Golden Princess 7/21/06, Golden Princess 2/24/07, Explorer of the Seas 12/23/07, Island Princess 11/15/08