Year	% gross
1972	5.04022979736328
1975	9.60429954528809
1976	11.5428895950317
1977	14.0672903060913
1978	19.6548690795898
1979	24.9648094177246
1980	29.8927001953125
1981	33.677619934082
1982	37.1284217834473
1983	40.2970199584961
1984	43.6474304199219
1985	46.8760185241699
1986	49.5700187683105
1987	52.412281036377
1988	55.0012588500977
1989	57.7231712341309
1990	61.4394302368164
1991	65.6394805908203
1992	71.3829574584961
1993	78.0468597412109
1994	69.0914916992188
1995	72.621208190918
1996	74.5960311889648
1997	75.9737930297852
1998	72.8848724365234
1999	75.0125503540039
2000	76.411018371582
2001	77.6344299316406
2002	79.2769622802734
2003	82.0032272338867
2004	85.3643035888672
2005	87.8826217651367
2006	89.6568374633789
2007	91.6896286010742
2008	94.7702865600586
2009	97.4385299682617
2010	98.8191604614258
2011	98.9926834106445
2012	99.0526733398438
2013	98.6631622314453
2014	97.8893508911133
2015	97.2765808105469
2016	95.8994522094727
2017	95.3652496337891
2018	96.0029907226563
2019	96.3921737670898
2020	96.3390502929688