Year	% gross
1970	41.2858085632324
1971	41.3063087463379
1972	41.5434608459473
1973	43.1536407470703
1974	44.9021606445313
1975	46.8433685302734
1976	48.2966117858887
1977	48.4204406738281
1978	47.9756698608398
1979	48.213321685791
1980	48.8755798339844
1981	50.490909576416
1982	51.6073684692383
1983	52.8622398376465
1984	54.5063705444336
1985	55.9535217285156
1986	57.9337615966797
1987	58.9626007080078
1988	59.6095199584961
1989	58.9721488952637
1990	59.8422317504883
1991	61.2464981079102
1992	61.9798698425293
1993	63.187198638916
1994	64.6459884643555
1995	65.4873733520508
1996	66.9054870605469
1997	66.9749908447266
1998	69.1682891845703
1999	67.2291030883789
2000	66.8433685302734
2001	68.0172882080078
2002	69.2425918579102
2003	70.1885223388672
2004	70.4777297973633
2005	74.0754623413086
2006	72.7185287475586
2007	73.5476379394531
2008	74.3850326538086
2009	74.7325134277344
2010	76.3572463989258
2011	78.2550506591797
2012	79.7789993286133
2013	76.7269592285156
2014	75.2302398681641
2015	78.3037414550781
2016	79.0475311279297
2017	79.4839096069336
2018	79.7740097045898
2019	80.6462326049805
2020	80.7386779785156