Year	% gross
1970	12.5665502548218
1971	12.5657796859741
1972	12.435079574585
1973	12.7468099594116
1974	13.3716201782227
1975	14.0538101196289
1976	14.9183197021484
1977	15.783109664917
1978	16.4410991668701
1979	16.713249206543
1980	16.9911594390869
1981	17.2540702819824
1982	17.1239204406738
1983	16.6624298095703
1984	16.6184902191162
1985	16.657190322876
1986	16.8982906341553
1987	16.7171401977539
1988	16.667200088501
1989	17.1705493927002
1990	17.2699203491211
1991	18.1602191925049
1992	18.3863506317139
1993	19.8606491088867
1994	22.2062206268311
1995	24.1481094360352
1996	27.5452194213867
1997	30.2564105987549
1998	31.4096698760986
1999	35.5604095458984
2000	39.0441093444824
2001	43.7365989685059
2002	48.0998382568359
2003	51.3495407104492
2004	54.1558990478516
2005	57.1708488464355
2006	60.1693496704102
2007	63.0290489196777
2008	67.3869400024414
2009	70.2541809082031
2010	71.1350479125977
2011	69.3709411621094
2012	67.079719543457
2013	65.5616607666016
2014	64.1404571533203
2015	63.3001098632812
2016	63.4850883483887
2017	64.0125579833984
2018	64.4177474975586
2019	64.5567932128906
2020	64.9225692749023
2021	66.0024032592773
2022	66.0926208496094