Year	% gross
1970	5.30975008010864
1971	5.29149007797241
1972	5.33997011184692
1973	5.40604019165039
1974	5.55922985076904
1975	5.7696099281311
1976	5.99351978302002
1977	6.14399003982544
1978	6.32988977432251
1979	6.67494010925293
1980	6.95474004745483
1981	7.15151977539062
1982	7.1951699256897
1983	7.2136697769165
1984	7.23780012130737
1985	7.24550008773804
1986	7.39067983627319
1987	7.52144002914429
1988	7.47712993621826
1989	7.54653978347778
1990	7.60130977630615
1991	7.6693000793457
1992	7.72487020492554
1993	7.85585021972656
1994	8.27643966674805
1995	8.73668956756592
1996	9.43560981750488
1997	10.2262096405029
1998	11.1553897857666
1999	12.1635303497314
2000	13.0473403930664
2001	13.9358797073364
2002	15.3078098297119
2003	16.5029106140137
2004	17.594030380249
2005	18.5810699462891
2006	20.0161304473877
2007	21.1674098968506
2008	22.4633007049561
2009	23.5179901123047
2010	25.0059108734131
2011	27.0104598999023
2012	28.7912502288818
2013	30.1772594451904
2014	33.6193809509277
2015	35.1363792419434
2016	36.1188812255859
2017	36.7994995117188
2018	37.589469909668
2019	39.0081214904785
2020	40.4823303222656
2021	42.1973991394043
2022	43.1305999755859