Year	% gross
1970	18.9871406555176
1971	19.0410709381104
1972	19.5462799072266
1973	20.0051803588867
1974	20.3539009094238
1975	20.7997303009033
1976	21.1996994018555
1977	21.720760345459
1978	22.2979202270508
1979	22.9950904846191
1980	23.8426990509033
1981	24.4563694000244
1982	25.2320499420166
1983	26.9815807342529
1984	27.1534900665283
1985	28.108549118042
1986	29.0619697570801
1987	29.4464702606201
1988	29.6544303894043
1989	30.0373992919922
1990	31.409610748291
1991	32.9757118225098
1992	34.4781913757324
1993	35.9358215332031
1994	37.0230598449707
1995	37.5500793457031
1996	38.03173828125
1997	39.1572113037109
1998	39.5363998413086
1999	39.8247909545898
2000	41.0784492492676
2001	41.7455101013184
2002	43.2541694641113
2003	45.498291015625
2004	46.3473892211914
2005	47.6501007080078
2006	48.5408515930176
2007	49.9248313903809
2008	52.0986404418945
2009	53.0415000915527
2010	55.3707885742188
2011	57.5833892822266
2012	59.5100212097168
2013	61.1804695129395
2014	63.4010200500488
2015	63.6921806335449
2016	64.5667419433594
2017	63.9308815002441
2018	65.1688003540039
2019	65.769416809082
2020	66.7508010864258
2021	67.5665817260742
2022	68.4090270996094