Year	% gross
1971	16.4137001037598
1972	17.7722206115723
1973	19.266580581665
1974	21.2190704345703
1975	21.3165798187256
1976	21.7090091705322
1977	23.8232192993164
1978	23.6653995513916
1979	24.4426803588867
1980	25.3798809051514
1981	25.6824207305908
1982	26.7396297454834
1983	28.5390892028809
1984	29.1615791320801
1985	29.5910892486572
1986	29.2478408813477
1987	31.6445503234863
1988	31.7836494445801
1989	33.7706489562988
1990	38.416618347168
1991	42.4999389648438
1992	46.0546798706055
1993	50.4808616638184
1994	54.6908493041992
1995	54.8278312683105
1996	59.3302688598633
1997	63.6204490661621
1998	64.7325134277344
1999	67.7941513061523
2000	69.8772201538086
2001	69.9630813598633
2002	72.3173294067383
2003	77.970588684082
2004	78.612548828125
2005	78.4450302124023
2006	77.9310684204102
2007	77.0373611450195
2008	73.5914688110352
2009	73.0674514770508
2010	72.1170806884766
2011	71.0614166259766
2012	71.7047576904297
2013	75.8635787963867
2014	78.2397384643555
2015	79.1828231811523
2016	82.0374526977539
2017	83.7353363037109
2018	85.3883514404297
2019	85.7633819580078
2020	87.1685333251953
2021	93.9243011474609