Year	% gross
1970	2.25127005577087
1971	2.28328990936279
1972	2.37484002113342
1973	2.39811992645264
1974	2.51455998420715
1975	2.43963003158569
1976	2.3396999835968
1977	2.53644990921021
1978	2.55263996124268
1979	3.00369000434875
1980	3.12160992622375
1981	3.17509007453918
1982	3.30295991897583
1983	3.668869972229
1984	3.88790988922119
1985	3.94102001190186
1986	4.00624990463257
1987	3.92768001556396
1988	3.71026992797852
1989	3.71165990829468
1990	3.85325002670288
1991	3.92080998420715
1992	3.88228011131287
1993	3.95650005340576
1994	3.89665007591248
1995	3.8905200958252
1996	3.95486998558044
1997	3.98359990119934
1998	4.10865020751953
1999	4.31427001953125
2000	4.57364988327026
2001	5.12668991088867
2002	5.2894401550293
2003	5.53220987319946
2004	5.61900997161865
2005	6.00525999069214
2006	6.51964998245239
2007	7.07280015945435
2008	7.83165979385376
2009	8.85659980773926
2010	9.74717998504639
2011	10.3415298461914
2012	10.5179195404053
2013	10.7281198501587
2014	10.8148603439331
2015	11.169659614563
2016	11.4503402709961
2017	11.461009979248
2018	11.9279098510742
2019	12.455340385437
2020	12.3293600082397
2021	12.1320600509644