Year	% gross
1971	3.59531998634338
1972	4.92033004760742
1973	6.37245988845825
1974	7.15292978286743
1975	8.71026039123535
1976	10.5142698287964
1977	13.5380802154541
1978	14.9830102920532
1979	15.8109798431396
1980	16.5913200378418
1981	16.1866302490234
1982	16.4182395935059
1983	16.1264495849609
1984	17.0607109069824
1985	18.1494998931885
1986	19.799919128418
1987	21.5239105224609
1988	22.0765705108643
1989	21.2338104248047
1990	20.6687107086182
1991	20.8712291717529
1992	19.6843605041504
1993	17.9441394805908
1994	16.7018394470215
1995	14.2646903991699
1996	13.4110298156738
1997	13.2988901138306
1998	13.4842596054077
1999	21.1659107208252
2000	23.0279693603516
2001	26.1085300445557
2002	27.4472808837891
2003	32.5828590393066
2004	52.4897499084473
2005	60.205940246582
2006	84.9542770385742
2007	105.414001464844
2008	117.719940185547
2009	114.488418579102
2010	94.1727066040039
2011	79.0247268676758
2012	61.7317886352539
2013	47.9959983825684
2014	40.5119895935059
2015	36.2177200317383
2016	34.4567909240723
2017	40.4316596984863
2018	41.5943794250488
2019	43.9937782287598
2020	45.9299087524414
2021	51.0785484313965