Year	% gross
1971	40.60546875
1972	42.3701782226562
1973	44.0150299072266
1974	45.4351692199707
1975	49.8717613220215
1976	52.5657615661621
1977	55.8047218322754
1978	57.9883918762207
1979	58.6691207885742
1980	59.8024291992188
1981	60.2486915588379
1982	61.588981628418
1983	63.0086288452148
1984	64.3820495605469
1985	65.7469100952148
1986	67.9310607910156
1987	69.5233612060547
1988	68.4078903198242
1989	66.6546173095703
1990	77.5085601806641
1991	76.932991027832
1992	69.7275314331055
1993	70.3718566894531
1994	76.354118347168
1995	72.7886962890625
1996	70.7865600585938
1997	75.5664672851562
1999	80.0623168945312
2000	81.5406723022461
2001	82.9689331054688
2003	82.2742691040039
2004	81.1699371337891
2009	63.6966094970703
2010	65.7940368652344
2011	73.6024627685547
2012	74.796142578125
2013	76.4359283447266
2014	75.8075485229492
2016	79.4716491699219
2017	80.4218978881836
2018	81.0146636962891
2019	82.1355361938477
2020	84.3798675537109
2021	87.0965423583984