Year	% gross
1970	8.36196994781494
1971	8.24425983428955
1972	8.45320987701416
1973	8.72663974761963
1974	9.00889015197754
1975	9.47511959075928
1976	10.0148801803589
1977	10.2679796218872
1978	10.6031999588013
1979	10.954719543457
1980	11.3640899658203
1981	11.6816396713257
1982	11.7451400756836
1983	11.7587099075317
1984	11.760290145874
1985	11.7118101119995
1986	11.8780698776245
1987	12.1139698028564
1988	12.2131299972534
1989	12.415789604187
1990	12.7166900634766
1991	12.9308004379272
1992	13.3220996856689
1993	13.8141202926636
1994	14.4682302474976
1995	15.079870223999
1996	15.8455696105957
1997	16.6240901947021
1998	17.2248191833496
1999	18.241849899292
2000	19.0823402404785
2001	20.0078601837158
2002	21.3732490539551
2003	22.5390396118164
2004	23.5864601135254
2005	24.5732097625732
2006	25.8446502685547
2007	26.8683204650879
2008	28.0472202301025
2009	29.0079402923584
2010	30.3789405822754
2011	32.1196403503418
2012	33.636531829834
2013	34.7838287353516
2014	37.5220413208008
2015	38.6809883117676
2016	39.4228210449219
2017	39.9046401977539
2018	40.4765281677246
2019	41.6159210205078
2020	42.7571983337402
2021	44.1263999938965
2022	44.7522392272949