Year	% gross
1970	6.59968996047974
1971	6.63037014007568
1972	6.92416000366211
1973	7.31311988830566
1974	7.57033014297485
1975	7.99245977401733
1976	8.37913036346436
1977	8.79821014404297
1978	9.58901023864746
1979	10.3581895828247
1980	11.2693996429443
1981	12.4515600204468
1982	13.6732702255249
1983	13.8133201599121
1984	14.118390083313
1985	15.6685304641724
1986	16.2644596099854
1987	16.6354598999023
1988	16.4956207275391
1989	16.0521697998047
1990	16.0638904571533
1991	16.2747993469238
1992	16.3762702941895
1993	16.4485206604004
1994	16.5574207305908
1995	17.2118701934814
1996	17.2141895294189
1997	17.2317008972168
1998	17.6200904846191
1999	18.0182304382324
2000	18.5596904754639
2001	19.596809387207
2002	20.4105396270752
2003	22.017650604248
2004	23.2918090820312
2005	24.2785205841064
2006	24.9955501556396
2007	25.2409801483154
2008	27.842809677124
2009	29.9422206878662
2010	31.9356803894043
2011	32.9855995178223
2012	34.5070190429688
2013	37.2675285339355
2014	35.999340057373
2015	36.9189987182617
2016	36.5321502685547
2017	37.2830200195312
2018	37.9426498413086
2019	38.4778099060059
2020	39.3135681152344
2021	39.6659393310547
2022	39.5506591796875