Year	% gross
1971	53.2286796569824
1972	54.2588386535645
1973	53.759391784668
1974	52.6925086975098
1975	52.7062911987305
1976	54.2462005615234
1977	63.5404014587402
1978	66.7079162597656
1979	69.344108581543
1980	71.8594512939453
1981	74.3805389404297
1982	78.7084503173828
1983	82.6942977905273
1984	86.0266723632812
1985	87.1583633422852
1986	87.5137023925781
1987	81.8239898681641
1988	76.877067565918
1989	71.3421173095703
1990	65.8466796875
1992	51.502628326416
1993	51.3318710327148
1994	66.3139419555664
1995	88.7838592529297
1996	91.4261703491211
1997	87.1909103393555
1998	85.6277770996094
1999	86.3503112792969
2000	86.8855514526367
2001	88.376350402832
2003	97.5049209594727
2004	101.7216796875
2005	108.831367492676
2006	101.005310058594
2007	101.295112609863
2008	99.5422821044922
2009	99.4410095214844
2010	99.4430770874023
2011	98.1292266845703
2012	95.3978424072266
2013	92.5727386474609
2014	90.0349197387695
2015	95.2544174194336