Year	% gross
1970	6.08359003067017
1971	6.86772012710571
1972	7.75181007385254
1973	8.72964954376221
1974	9.95224952697754
1975	11.2773399353027
1976	11.6069803237915
1977	11.7401695251465
1978	12.0388498306274
1979	12.5814304351807
1980	13.0885200500488
1981	13.5612297058105
1982	13.799220085144
1983	14.1319599151611
1984	14.605299949646
1985	15.1681804656982
1986	15.7429504394531
1987	15.9479703903198
1988	16.3813304901123
1989	16.4565296173096
1990	16.4019603729248
1991	16.7112598419189
1992	16.6388397216797
1993	16.5851993560791
1994	16.7991409301758
1995	17.2757205963135
1996	17.9062595367432
1997	18.888599395752
1998	20.3727397918701
1999	21.6187305450439
2000	22.7844696044922
2001	24.1493091583252
2002	25.9177093505859
2003	27.3926105499268
2004	28.5319499969482
2005	30.1297492980957
2006	32.9765281677246
2007	34.0983810424805
2008	36.9003601074219
2009	38.0305709838867
2010	39.9713096618652
2011	41.8585395812988
2012	43.7974510192871
2013	45.0563507080078
2014	46.8118705749512
2015	48.1633682250977
2016	50.2149887084961
2017	51.5137100219727
2018	52.2137489318848
2019	53.1049003601074
2020	54.587230682373
2021	56.4185104370117
2022	56.3931999206543