Here is a statistical look at how much tickets have went up in price over the last 11 years.

2001-2011 ticket price snapshot. Assumption is a 1 day - 1 park base ticket w/o hopper option

Year	$	Date when prices went up. Except '01
2001	48	01/09/01
2002	50	September 8, 2002
2003	52	June 1, 2003
2004	54.75	February 2004
2005	59.75	January 2, 2005
2006	67	01/01/06
2007	71	February 11, 2007
2008	75	08/03/08
2009	79	05/16/09
2010	82	August 5, 2010
2011	85	June 12, 2011