Year	% gross
1970	22.447509765625
1971	22.6715297698975
1972	23.1315994262695
1973	23.4796104431152
1974	23.2953090667725
1975	23.451099395752
1976	23.4523906707764
1977	24.368049621582
1978	25.0952606201172
1979	26.0133094787598
1980	26.9720096588135
1981	26.6408290863037
1982	27.3284492492676
1983	28.0882797241211
1984	27.9888706207275
1985	27.7766399383545
1986	27.3274002075195
1987	27.9692306518555
1988	28.144100189209
1989	27.9381809234619
1990	27.4981708526611
1991	28.2480697631836
1992	28.7347297668457
1993	29.2134208679199
1994	29.9520092010498
1995	30.6750907897949
1996	31.1281204223633
1997	31.5727806091309
1998	32.5241088867188
1999	33.2235412597656
2000	34.0082702636719
2001	35.0940093994141
2002	36.0960311889648
2003	37.2887802124023
2004	38.4040985107422
2005	38.9131011962891
2006	40.3217887878418
2007	41.2277183532715
2008	42.1945114135742
2009	44.0525016784668
2010	45.2129211425781
2011	45.9087791442871
2012	46.9591102600098
2013	47.7192306518555
2014	48.0179710388184
2015	48.1425704956055
2016	49.3017196655273
2017	48.9101486206055
2018	49.7704887390137
2019	49.7894515991211
2020	50.0482902526855
2021	50.0302581787109