Year	% gross
1970	25.3764495849609
1971	27.0362491607666
1972	29.051700592041
1973	30.8320293426514
1974	31.8815498352051
1975	32.4585990905762
1976	33.3730087280273
1977	34.5751991271973
1978	34.9905395507812
1979	34.0267791748047
1980	32.4972114562988
1981	31.6855792999268
1982	31.1672801971436
1983	31.5998497009277
1984	31.748010635376
1985	32.8077697753906
1986	33.8814315795898
1987	35.1743011474609
1988	35.9897804260254
1989	36.5400505065918
1990	37.3596611022949
1991	38.7530708312988
1992	40.1854782104492
1993	41.4256210327148
1994	42.4548416137695
1995	43.5477104187012
1996	44.8188209533691
1997	46.1507797241211
1998	47.2580795288086
1999	48.1620788574219
2000	49.3576812744141
2001	50.678409576416
2002	53.0547409057617
2003	54.4644012451172
2004	55.7845916748047
2005	57.074348449707
2006	57.8233184814453
2007	60.0503196716309
2008	61.9298286437988
2009	63.4645195007324
2010	64.9789810180664
2011	66.5470581054688
2012	67.6206817626953
2013	69.2689590454102
2014	70.3855972290039
2015	70.3969268798828
2016	70.6760025024414
2017	70.2846221923828
2018	71.066650390625
2019	71.4567184448242
2020	71.9679794311523
2021	72.5759506225586
2022	73.0807037353516