Year	% gross
1970	7.07630014419556
1971	7.21681022644043
1972	7.36501979827881
1973	7.52514982223511
1974	7.83905982971191
1975	8.5538501739502
1976	9.15590953826904
1977	9.79837989807129
1978	10.2369203567505
1979	10.793740272522
1980	11.3653497695923
1981	12.0563402175903
1982	12.9095497131348
1983	13.496190071106
1984	14.0818099975586
1985	14.5117902755737
1986	15.2581100463867
1987	15.7394599914551
1988	16.3515605926514
1989	16.3143291473389
1990	16.1234703063965
1991	16.6616592407227
1992	16.6178493499756
1993	16.5965805053711
1994	16.9967403411865
1995	17.3620300292969
1996	17.5974292755127
1997	14.5725202560425
1998	16.7064094543457
1999	17.7555294036865
2000	19.5729503631592
2001	20.9568691253662
2002	22.0895309448242
2003	23.4727306365967
2004	25.4615497589111
2005	28.1101207733154
2006	31.6274108886719
2007	34.3412895202637
2008	36.7509307861328
2009	38.7772102355957
2010	40.7975311279297
2011	43.2825317382813
2012	45.7615699768066
2013	47.3437385559082
2014	49.1729202270508
2015	51.2425498962402
2016	52.7068786621094
2017	54.8920516967773
2018	55.7059898376465
2019	56.8959808349609
2020	55.701530456543