Year	% gross
1979	16.3756904602051
1980	16.6334800720215
1981	16.2777690887451
1982	16.0714797973633
1983	15.9384803771973
1984	15.9052295684814
1985	15.9500198364258
1986	16.0465106964111
1987	16.3699398040771
1988	16.6367797851563
1989	16.5445003509521
1990	16.691650390625
1991	16.7103404998779
1992	16.7001705169678
1993	16.7077903747559
1994	16.2375907897949
1995	16.2721900939941
1996	16.3390998840332
1997	16.3764705657959
1998	16.5344905853271
1999	12.3728199005127
2000	13.9102096557617
2001	13.874719619751
2002	15.4500198364258
2003	17.1123600006104
2004	19.5058002471924
2005	19.3259906768799
2006	21.3649806976318
2007	22.6298503875732
2008	21.4750003814697
2009	24.6380596160889
2010	24.4653301239014
2011	29.1136093139648
2012	33.9465599060059
2013	38.766658782959
2014	20.4496192932129
2015	23.1215000152588
2016	22.7533302307129
2017	23.197509765625
2018	23.3386993408203
2019	23.7571601867676
2020	23.9825191497803