Year	% gross
1970	8.17368030548096
1971	8.20368003845215
1972	8.43927955627441
1973	8.63663959503174
1974	8.77455043792725
1975	9.08862018585205
1976	9.41100025177002
1977	9.87528038024902
1978	10.3170795440674
1979	10.7855796813965
1980	11.5124502182007
1981	12.1518602371216
1982	12.7915697097778
1983	13.1975202560425
1984	13.4767303466797
1985	13.5909299850464
1986	13.7364902496338
1987	13.9776201248169
1988	14.3926801681519
1989	14.2520198822021
1990	14.2814302444458
1991	14.5531101226807
1992	14.451379776001
1993	14.3860101699829
1994	14.4422397613525
1995	15.2333002090454
1996	15.2926797866821
1997	15.3647203445435
1998	15.95934009552
1999	16.5723209381104
2000	17.0733890533447
2001	18.027099609375
2002	18.798999786377
2003	19.7013492584229
2004	20.6477108001709
2005	21.9409294128418
2006	23.403829574585
2007	25.0322399139404
2008	26.9893798828125
2009	28.7084407806396
2010	30.535270690918
2011	32.1248207092285
2012	33.4272384643555
2013	34.7508583068848
2014	35.2443313598633
2015	35.7905502319336
2016	36.309398651123
2017	36.8527183532715
2018	37.549129486084
2019	37.6980514526367
2020	38.1493797302246
2021	38.3259696960449
2022	38.1703186035156