Year	% gross
1971	1.94797003269196
1972	2.14411997795105
1974	2.79428005218506
1984	8.27530956268311
1991	11.9232702255249
1992	10.8623600006104
1993	9.89383029937744
1994	9.4217700958252
1995	9.2522497177124
1996	9.48188972473145
1999	10.5850200653076
2000	11.4135704040527
2001	13.6109199523926
2002	14.5541200637817
2003	14.1526203155518
2004	15.5896997451782
2005	17.8444595336914
2006	21.417989730835
2007	24.7045402526855
2008	26.9982395172119
2009	28.4797897338867
2010	30.8310699462891
2011	33.3287200927734
2012	35.5110282897949
2013	32.4990005493164
2014	33.3040008544922
2015	34.3281288146973