Year	% gross
1973	14.146240234375
1974	14.2810001373291
1975	14.420599937439
1976	14.5151700973511
1977	14.6212596893311
1978	14.9279699325562
1979	15.0665197372437
1980	15.2248001098633
1981	15.0825500488281
1982	14.870849609375
1983	14.7552995681763
1984	14.6521100997925
1985	14.5920495986938
1986	14.8278703689575
1987	15.0801496505737
1988	15.2853498458862
1989	15.3471899032593
1990	15.3870801925659
1991	15.3898897171021
1992	15.429630279541
1993	15.3611097335815
1994	15.1679000854492
1995	15.2549600601196
1996	15.5808801651001
1997	15.0547304153442
1998	15.2897701263428
1999	13.261360168457
2000	14.4939403533936
2001	15.0063104629517
2002	16.3466796875
2003	17.8279304504395
2004	19.1841506958008
2005	19.8421802520752
2006	21.2973003387451
2007	19.8473091125488
2008	19.6631298065186
2009	21.0249099731445
2010	21.1221809387207
2011	22.9719104766846
2012	26.2625694274902
2013	28.8193798065186
2014	23.6617298126221
2015	25.5410308837891
2016	26.6837291717529
2017	27.1933498382568
2018	27.1215991973877
2019	27.4371891021729
2020	28.1401901245117