Year	% gross
1970	5.72864007949829
1971	5.72882986068726
1972	5.99220991134644
1973	6.35013008117676
1974	6.75883007049561
1975	7.31947994232178
1976	8.01286029815674
1977	8.7765998840332
1978	9.25222015380859
1979	9.21523952484131
1980	9.52447986602783
1981	10.0411901473999
1982	10.374529838562
1983	10.4992904663086
1984	10.7181701660156
1985	10.6651000976562
1986	10.9655103683472
1987	11.019570350647
1988	11.0783100128174
1989	10.7546195983887
1990	10.7665395736694
1991	10.4471197128296
1992	11.0596799850464
1993	11.8874197006226
1994	12.3909101486206
1995	13.136830329895
1996	14.0473299026489
1997	14.948450088501
1998	15.7315301895142
1999	17.0047798156738
2000	17.2507190704346
2001	17.8405303955078
2002	18.7273693084717
2003	18.8205299377441
2004	20.0234794616699
2005	21.0628509521484
2006	21.4690208435059
2007	21.9197597503662
2008	22.5374794006348
2009	23.2251491546631
2010	23.9708309173584
2011	23.6591606140137
2012	25.0229606628418
2013	26.6702709197998
2014	27.9827404022217
2015	29.3616790771484
2016	29.9062194824219
2017	30.8845901489258
2018	32.1647605895996
2019	33.0184211730957
2020	33.3901405334473
2021	33.4596290588379
2022	33.5131683349609