Year	% gross
1970	58.0417594909668
1971	58.4704399108887
1972	59.1277084350586
1973	61.0835189819336
1974	62.7144317626953
1975	64.3393783569336
1976	65.2628021240234
1977	66.3941802978516
1978	67.2343215942383
1979	68.1645584106445
1980	69.2645721435547
1981	70.1569900512695
1982	70.3771667480469
1983	70.8972015380859
1984	71.5102767944336
1985	72.4307708740234
1986	73.2570495605469
1987	73.2690734863281
1988	73.5788269042969
1989	73.8827133178711
1990	74.6352081298828
1991	74.7877883911133
1992	73.9168472290039
1993	74.8819732666016
1994	75.8110885620117
1995	76.7716522216797
1996	79.0569686889648
1997	80.6013793945313
1998	81.8658218383789
1999	83.1831970214844
2000	84.3231964111328
2001	85.3272933959961
2002	86.4943466186523
2003	87.6099090576172
2004	87.2825927734375
2005	90.0141983032227
2006	90.6268692016602
2007	91.1365432739258
2008	92.0032119750977
2009	92.3774490356445
2010	93.3055267333984
2011	94.3455581665039
2012	94.654167175293
2013	95.0066986083984
2014	95.140022277832
2015	96.7104415893555
2016	97.6772384643555
2017	97.2711868286133
2018	98.5951995849609
2019	100.185043334961
2020	100.920806884766