Year	% gross
1970	15.6418304443359
1971	15.7761898040771
1972	16.2143592834473
1973	16.5397491455078
1974	16.7794895172119
1975	17.4858207702637
1976	18.1520099639893
1977	18.8204803466797
1978	19.7849807739258
1979	20.9860305786133
1980	22.4899406433105
1981	23.8062705993652
1982	25.3372898101807
1983	27.4665908813477
1984	29.2638397216797
1985	28.9463291168213
1986	27.4946594238281
1987	27.1920509338379
1988	26.9141902923584
1989	26.0400791168213
1990	26.0968208312988
1991	26.2060699462891
1992	25.899829864502
1993	25.9461498260498
1994	26.1855907440186
1995	26.4546794891357
1996	26.5833892822266
1997	26.6145191192627
1998	27.2084999084473
1999	27.4898109436035
2000	28.3362598419189
2001	29.8704490661621
2002	31.3191204071045
2003	32.4508895874023
2004	34.2222518920898
2005	35.1223793029785
2006	36.3105812072754
2007	37.5267906188965
2008	39.2906303405762
2009	40.9927101135254
2010	42.8720283508301
2011	44.0360298156738
2012	44.915470123291
2013	47.3935890197754
2014	46.0766792297363
2015	46.4944915771484
2016	45.745189666748
2017	45.7463302612305
2018	45.7460784912109
2019	46.2041702270508
2020	46.5827407836914
2021	46.9684410095215
2022	46.7357788085938