Year	% gross
1970	40.8386116027832
1971	40.8846282958984
1972	41.1015510559082
1973	42.3921012878418
1974	44.4509582519531
1975	46.0824813842773
1976	47.7868881225586
1977	48.0003395080566
1978	47.6352615356445
1979	47.8833198547363
1980	48.5143394470215
1981	50.0969390869141
1982	51.173511505127
1983	53.2565116882324
1984	55.073600769043
1985	56.4390907287598
1986	58.4846382141113
1987	58.773609161377
1988	58.5318603515625
1989	58.9945793151855
1990	59.4075393676758
1991	60.9794998168945
1992	62.000301361084
1993	62.7652816772461
1994	64.0656433105469
1995	64.6157073974609
1996	66.4862823486328
1997	66.8085327148438
1998	69.1909713745117
1999	67.4319534301758
2000	67.1572189331055
2001	68.4178924560547
2002	69.7632598876953
2003	70.0073471069336
2004	69.6467208862305
2005	73.3525314331055
2006	72.6828994750977
2007	73.3756103515625
2008	74.1629486083984
2009	74.4919891357422
2010	76.1874237060547
2011	78.071533203125
2012	79.6451263427734
2013	76.5018692016602
2014	75.4318923950195
2015	77.7397003173828
2016	78.8514099121094
2017	79.5194778442383
2018	79.9814834594727
2019	80.1705780029297
2020	80.8301086425781