Year	% gross
1971	11.602370262146
1972	12.7592697143555
1975	14.6987495422363
1976	16.7252502441406
1977	18.0659103393555
1978	19.220890045166
1979	20.0358104705811
1980	22.4498596191406
1981	23.7105197906494
1982	25.0256900787354
1983	25.7433605194092
1984	26.0216102600098
1985	26.0080604553223
1986	26.9503307342529
1987	27.2913703918457
1988	28.909969329834
1989	29.5717506408691
1990	31.6058197021484
1991	35.3427886962891
1992	38.4794883728027
1993	42.0412406921387
1994	46.8364715576172
1995	47.5330390930176
1996	48.7396507263184
1997	48.2025604248047
1998	48.4261589050293
1999	49.8326187133789
2000	52.193489074707
2001	54.3806610107422
2002	55.9926109313965
2003	57.211109161377
2004	58.8667411804199
2005	60.9890098571777
2006	62.2325782775879
2007	63.220100402832
2008	64.0393676757812
2009	64.7013626098633
2010	67.1528472900391
2011	79.5243835449219
2012	79.0309295654297
2015	85.2260589599609
2016	84.4458694458008
2017	88.58984375
2018	88.6447677612305
2020	90.979850769043
2021	95.8748321533203