Year	% gross
1970	40.276611328125
1971	43.0437202453613
1972	47.0350494384766
1973	51.1344413757324
1974	55.1954612731934
1975	57.5325088500977
1976	59.8033714294434
1977	62.3422088623047
1978	64.5620193481445
1979	65.1312484741211
1980	64.2291717529297
1981	63.8244781494141
1982	62.7857398986816
1983	62.3967399597168
1984	63.1395111083984
1985	62.9528312683105
1986	63.3750991821289
1987	63.2177085876465
1988	62.6313209533691
1989	61.6122512817383
1990	62.8490715026855
1999	66.3500900268555
2000	66.4087524414062
2001	68.7692565917969
2002	70.0085220336914
2004	69.8385162353516
2005	70.0052719116211
2006	70.2681198120117
2007	70.4421691894531
2008	71.8532409667969
2009	73.620719909668
2010	74.8266067504883
2011	75.1157913208008
2013	79.5940399169922
2014	79.5959091186523
2015	79.3752670288086
2016	84.5086898803711
2017	79.3612365722656
2021	84.7119979858398