Year	% gross
1971	5.39690017700195
1972	6.00091981887817
1973	6.39444017410278
1977	15.1596803665161
1978	19.0235500335693
1979	21.886079788208
1980	21.9372100830078
1981	23.2231903076172
1986	24.3489398956299
1988	27.5406608581543
1990	27.0911502838135
1992	23.969690322876
1993	26.4373893737793
1994	28.3624706268311
1995	28.810230255127
1996	28.8942604064941
1997	30.9277305603027
1998	33.392520904541
1999	37.0364303588867
2000	39.5291595458984
2001	41.5744285583496
2002	44.4551582336426
2003	47.1693382263184
2004	48.8880386352539
2005	49.2690887451172
2006	48.5709495544434
2007	49.4114685058594
2008	50.431468963623
2009	51.9216003417969
2010	53.2323989868164
2011	51.1679992675781
2012	53.2223892211914
2013	56.2949981689453
2014	60.9238510131836
2015	64.6729965209961
2016	67.0930023193359
2017	68.338996887207
2018	68.2590026855469
2019	66.9700012207031
2020	64.0449981689453
2021	61.1549987792969
2022	57.7480010986328