Year	% gross
1977	9.35245990753174
1978	10.007360458374
1979	10.5613203048706
1980	11.1046199798584
1981	11.5666103363037
1982	11.9274597167969
1983	12.1888904571533
1984	12.4232902526855
1985	12.6191701889038
1986	13.0413799285889
1987	13.2838697433472
1988	13.5307998657227
1989	13.1004800796509
1990	12.6264600753784
1991	12.0226001739502
1992	11.7286996841431
1993	11.3116397857666
1994	10.7338695526123
1995	10.3203601837158
1996	9.97014045715332
1997	9.2326602935791
1998	10.7193899154663
1999	10.4254598617554
2000	10.7915697097778
2001	11.1984701156616
2002	11.5233001708984
2003	12.0262403488159
2004	12.7499399185181
2005	14.2258701324463
2006	15.3821601867676
2007	13.5078401565552
2008	13.9287204742432
2009	14.5724802017212
2010	15.0929899215698
2011	17.4336700439453
2012	19.529670715332
2013	20.9249897003174
2014	21.2702693939209
2015	21.9441795349121
2016	23.6126899719238
2017	24.9502105712891
2018	24.9774608612061
2019	25.6147308349609
2020	26.6719303131104