Year	% gross
1970	11.9763097763062
1971	11.9835500717163
1972	11.9329395294189
1973	12.4640102386475
1974	13.4566802978516
1975	14.3715400695801
1976	15.4903602600098
1977	16.570369720459
1978	17.4248600006104
1979	17.5160503387451
1980	17.7982501983643
1981	18.0352001190186
1982	17.9252395629883
1983	17.4020004272461
1984	17.5316791534424
1985	17.696849822998
1986	18.2119293212891
1987	17.9831600189209
1988	17.8026599884033
1989	18.23703956604
1990	18.4213695526123
1991	19.0763301849365
1992	19.5247802734375
1993	21.2680606842041
1994	24.2465896606445
1995	26.7908000946045
1996	31.10910987854
1997	34.3426284790039
1998	35.2256507873535
1999	40.1979904174805
2000	44.3460311889648
2001	50.1604385375977
2002	55.3473587036133
2003	59.054271697998
2004	62.3799209594727
2005	66.1165084838867
2006	70.0279235839844
2007	73.5722579956055
2008	79.1733322143555
2009	82.7770767211914
2010	84.6588363647461
2011	82.8874816894531
2012	79.5853576660156
2013	77.7095794677734
2014	75.6297836303711
2015	73.4944381713867
2016	74.3953170776367
2017	74.8694915771484
2018	75.4321212768555
2019	75.9506301879883
2020	75.3331069946289
2021	77.6621017456055
2022	77.5735015869141