Year	% gross
1971	56.9049797058105
1972	58.5851593017578
1973	61.8906402587891
1974	64.7587890625
1975	66.4516983032227
1976	69.3244094848633
1977	71.7888870239258
1978	73.9103164672852
1979	76.2566680908203
1980	78.2878494262695
1981	79.821533203125
1982	80.302360534668
1983	81.9783630371094
1984	83.0438232421875
1985	83.7910614013672
1986	87.4858779907227
1987	88.3527297973633
1988	87.7779083251953
1989	87.3239974975586
1990	90.2539215087891
1991	91.0841369628906
1992	91.7611770629883
1993	93.1531295776367
1994	93.9191284179688
1995	94.9317169189453
1996	95.7790908813477
1997	96.5610504150391
1998	97.8053588867188
1999	97.6630020141602
2000	98.2281875610352
2001	98.7081069946289
2002	100.341041564941
2003	102.19792175293
2004	103.294502258301
2005	102.809501647949
2006	102.164947509766
2007	100.45532989502
2008	99.5188064575195
2009	98.36865234375
2010	99.7449722290039
2011	99.8993835449219
2012	99.6841735839844
2013	98.7935104370117
2014	97.5845031738281
2015	97.0778427124023
2016	96.2828369140625
2017	93.9580230712891
2018	93.2357482910156
2019	92.9466400146484
2020	92.6589508056641