Year	% gross
1971	27.692310333252
1972	30.8617191314697
1973	35.4890289306641
1974	40.8565292358398
1975	42.9694519042969
1976	56.8117599487305
1977	51.6328506469727
1978	54.3508987426758
1979	57.8384017944336
1980	63.1918907165527
1981	65.9114303588867
1982	68.6852798461914
1983	73.9396362304688
1984	76.2253189086914
1985	80.6824264526367
1986	85.1592483520508
1987	85.033821105957
1988	84.6734924316406
1989	87.7143402099609
1990	91.467643737793
1991	91.1859130859375
1992	90.5665893554688
1993	97.3918914794922
1994	96.3467407226562
1995	95.9733276367188
1996	94.3549575805664
1998	95.4423522949219
1999	95.5129013061523
2000	98.236442565918
2001	98.1914596557617
2002	98.5448684692383
2003	100.580139160156
2004	101.124069213867
2005	102.335876464844
2006	101.799743652344
2007	100.888458251953
2008	102.374160766602
2009	99.5016098022461
2010	99.4061584472656
2011	96.5915908813477
2012	102.695922851562
2013	100.272010803223
2014	97.8229904174805
2015	102.855682373047
2016	102.042381286621
2017	102.791229248047
2018	101.613899230957
2019	106.114051818848
2020	106.676002502441