Year	% gross
1970	41.4394798278809
1971	41.7279205322266
1972	44.0384902954102
1973	46.1105194091797
1974	47.2610206604004
1975	48.778190612793
1976	50.2387504577637
1977	53.0554695129395
1978	56.1069297790527
1979	58.8563194274902
1980	61.1143989562988
1981	64.0766067504883
1982	66.3423233032227
1983	66.3134307861328
1984	66.6979293823242
1985	65.4443130493164
1986	64.1181716918945
1987	63.2391204833984
1988	63.8016510009766
1989	63.7946891784668
1990	63.1187782287598
1991	64.7187881469727
1992	65.4247970581055
1993	66.2582778930664
1994	67.0338363647461
1995	67.3230590820312
1996	66.6405563354492
1997	69.1584320068359
1998	70.1465072631836
1999	70.9486999511719
2000	73.3380279541016
2001	74.9817276000977
2002	77.792236328125
2003	80.8986892700195
2004	83.1179580688477
2005	86.0934600830078
2006	87.8504791259766
2007	89.1607208251953
2008	89.9339065551758
2009	90.8718566894531
2010	91.4872512817383
2011	92.2049713134766
2012	93.3536605834961
2013	93.216438293457
2014	93.0134887695312
2015	92.4951782226562
2016	92.8763809204102
2017	93.3432693481445
2018	94.3401107788086
2019	95.5876388549805
2020	96.2620162963867
2021	95.8258209228516
2022	95.904670715332