Year	% gross
1970	7.9574499130249
1971	8.34605026245117
1972	8.83714008331299
1973	9.30774021148682
1974	9.89381980895996
1975	10.955060005188
1976	12.4745197296143
1977	13.6976699829102
1978	14.78590965271
1979	16.3939609527588
1980	17.6097507476807
1981	19.9233303070068
1982	22.7972793579102
1983	25.0430202484131
1984	27.6608390808105
1985	29.4636192321777
1986	31.8439407348633
1987	38.7579193115234
1988	39.1461715698242
1989	39.5512313842773
1990	43.1122207641602
1991	41.4494705200195
1992	43.7043113708496
1993	45.3731803894043
1994	46.1847610473633
1995	48.06005859375
1996	49.5338096618652
1997	50.5686111450195
1998	52.0858306884766
1999	52.8881607055664
2000	54.3338813781738
2001	55.194278717041
2002	55.7046089172363
2003	56.8132209777832
2004	58.0275688171387
2005	60.4218711853027
2006	62.7324295043945
2007	64.3871078491211
2008	66.7046966552734
2009	67.8334274291992
2010	73.6262588500977
2011	75.8015823364258
2012	76.3933792114258
2013	70.4848175048828
2014	72.2234115600586
2015	73.0727996826172
2016	74.3686676025391
2017	75.4130935668945
2018	75.9543609619141
2019	76.2214584350586
2020	75.3437576293945