Year	% gross
1977	9.34391975402832
1978	9.99193000793457
1979	10.574049949646
1980	11.1643800735474
1981	11.7203197479248
1982	11.8459901809692
1983	12.2860698699951
1984	12.7412395477295
1985	13.2125101089478
1986	13.9707098007202
1987	14.5325899124146
1988	15.1010503768921
1989	14.3784503936768
1990	13.6437397003174
1991	13.0496196746826
1992	12.468279838562
1993	11.9224996566772
1994	11.2477798461914
1995	10.7878799438477
1996	10.4160499572754
1997	9.40785980224609
1998	10.9853897094727
1999	10.7936201095581
2000	11.3010902404785
2001	11.8710498809814
2002	12.0143003463745
2003	12.3139600753784
2004	12.8901700973511
2005	14.0811901092529
2006	14.8459396362305
2007	13.050950050354
2008	14.1597900390625
2009	14.7796297073364
2010	15.0019302368164
2011	17.1697998046875
2012	19.5325698852539
2013	20.4179592132568
2014	21.1317596435547
2015	21.9551601409912
2016	23.5095901489258
2017	24.912260055542
2018	24.964750289917
2019	25.534049987793
2020	26.5639495849609