Year	% gross
1971	37.8808097839355
1972	35.1353912353516
1973	33.7931213378906
1974	32.952320098877
1975	33.1752395629883
1976	34.5908203125
1977	35.0179786682129
1978	34.0533790588379
1979	34.4067192077637
1980	33.4320182800293
1981	36.2491493225098
1982	39.5399513244629
1983	41.7655410766602
1984	43.5515899658203
1985	44.6542510986328
1986	45.8983001708984
1987	46.0701904296875
1988	46.3166694641113
1989	46.3588218688965
1990	46.9552688598633
1991	34.7856903076172
1992	39.1231498718262
1993	53.2918281555176
1994	58.9873085021973
1995	68.6796798706055
1996	71.1130599975586
1997	73.5049209594727
1998	79.310546875
1999	79.5145797729492
2000	77.9804992675781
2001	75.6629867553711
2002	75.0884399414063
2003	73.6491088867188
2004	71.9978103637695
2005	75.4935684204102
2006	77.561882019043
2007	82.2134094238281
2008	84.1247711181641
2010	83.9972610473633
2011	83.2975006103516
2012	82.1654510498047
2013	77.3790817260742
2014	71.6608963012695
2015	68.0111389160156
2016	68.3707962036133
2017	65.3118896484375
2018	62.4524688720703
2019	60.2002716064453
2020	60.2476997375488