Year	% gross
1983	19.5136795043945
1984	19.8524208068848
1985	20.1679000854492
1986	20.5158290863037
1987	21.0313491821289
1988	21.4025497436523
1989	21.3079299926758
1990	21.2501106262207
1991	21.1092395782471
1992	20.7486095428467
1993	20.1932106018066
1994	19.7078990936279
1995	19.3083400726318
1996	19.1837100982666
1997	18.2626094818115
1998	18.3622398376465
1999	17.6404495239258
2000	17.937780380249
2001	17.4451198577881
2002	17.0219593048096
2003	16.9328994750977
2004	17.9994297027588
2005	19.1371593475342
2006	21.599760055542
2007	22.8825206756592
2008	23.8246402740479
2009	24.1761302947998
2010	25.4809608459473
2011	28.0435600280762
2012	30.3273601531982
2013	32.723991394043
2014	28.4450702667236
2015	29.9578094482422
2016	31.0160007476807
2017	32.6803512573242
2018	33.2160186767578
2019	33.8130187988281
2020	34.9193496704102