Year	% gross
1970	13.0097303390503
1971	13.2058095932007
1972	13.6218004226685
1973	14.0149602890015
1974	14.136420249939
1975	14.3758296966553
1976	14.5254602432251
1977	14.6667900085449
1978	15.0641899108887
1979	15.5041599273682
1980	16.3807792663574
1981	16.509349822998
1982	17.6064205169678
1983	18.2175998687744
1984	18.7563495635986
1985	19.583610534668
1986	20.278980255127
1987	20.9625091552734
1988	21.0713691711426
1989	20.9362907409668
1990	20.8423309326172
1991	21.8322792053223
1992	22.5673294067383
1993	22.8597297668457
1994	23.2916297912598
1995	24.2511692047119
1996	24.7077903747559
1997	25.2594604492188
1998	26.1083908081055
1999	26.7736892700195
2000	27.5468502044678
2001	28.5558204650879
2002	29.32839012146
2003	30.463680267334
2004	31.0275497436523
2005	31.8916397094727
2006	33.2388191223145
2007	33.9441413879395
2008	35.5614585876465
2009	37.1756210327148
2010	38.8745994567871
2011	39.9023284912109
2012	41.2087783813477
2013	42.6699409484863
2014	42.3914909362793
2015	43.456729888916
2016	43.9734802246094
2017	44.3380393981934
2018	45.4960098266602
2019	46.0410003662109
2020	46.5815887451172
2021	46.5625305175781
2022	46.3570289611816