Year	% gross
1971	13.1700601577759
1972	12.8504400253296
1973	12.9106597900391
1974	13.5530099868774
1975	13.9916801452637
1976	15.0017499923706
1977	15.6401395797729
1978	15.956919670105
1979	16.1583099365234
1980	16.0978603363037
1981	15.9969501495361
1982	15.3870601654053
1983	14.8214702606201
1984	14.7893400192261
1985	14.6943597793579
1986	14.9731597900391
1987	15.1789598464966
1988	15.6942796707153
1989	17.2960205078125
1990	16.5428504943848
1991	18.5514602661133
1992	17.9672298431396
1993	20.3132305145264
1994	22.8191394805908
1995	25.4743995666504
1996	28.3152008056641
1997	31.9570693969727
1998	32.8544998168945
1999	37.8364715576172
2000	42.1114311218262
2001	46.5284690856934
2002	49.2904510498047
2003	50.2877006530762
2004	51.527458190918
2005	53.2397918701172
2006	54.4488792419434
2007	56.0534591674805
2008	58.5899810791016
2009	60.1144104003906
2010	61.268741607666
2011	59.5889587402344
2012	59.0219383239746
2013	57.7012710571289
2014	55.9305191040039
2015	55.735710144043
2016	56.1340103149414
2017	56.7171401977539
2018	56.7068405151367
2019	56.1988182067871
2020	56.9566917419434
2021	56.8231201171875
2022	58.3194389343262