Year	% gross
1970	4.08995008468628
1971	4.1038498878479
1972	4.2448902130127
1973	4.4878101348877
1974	4.78530979156494
1975	5.19126987457275
1976	5.72768020629883
1977	6.09031009674072
1978	6.42156982421875
1979	6.56870985031128
1980	6.87054014205933
1981	7.31643009185791
1982	7.61343002319336
1983	7.78461980819702
1984	7.99782991409302
1985	8.1110200881958
1986	8.22828960418701
1987	8.27602005004883
1988	8.75028038024902
1989	8.69542026519775
1990	8.94791030883789
1991	8.88576030731201
1992	9.45335006713867
1993	10.3081398010254
1994	10.7510299682617
1995	11.5122098922729
1996	12.4192695617676
1997	13.3213901519775
1998	14.2788896560669
1999	15.6722803115845
2000	16.1735496520996
2001	16.8999900817871
2002	17.9822902679443
2003	18.4830303192139
2004	19.4809703826904
2005	20.7709808349609
2006	21.5941009521484
2007	21.6866607666016
2008	23.2503395080566
2009	24.0137004852295
2010	24.8029003143311
2011	24.4692096710205
2012	25.7130908966064
2013	27.2742290496826
2014	28.6902008056641
2015	30.4437294006348
2016	31.5388793945312
2017	32.3390083312988
2018	34.0614814758301
2019	34.7660713195801
2020	34.9565086364746
2021	34.7890892028809
2022	35.0056915283203