Year	% gross
1971	32.0636100769043
1972	34.8843383789062
1973	36.7836303710938
1974	39.208309173584
1975	40.5761795043945
1976	42.4267616271973
1977	48.5347518920898
1978	49.2563285827637
1979	50.2220001220703
1980	49.877628326416
1981	49.3344306945801
1982	49.5783386230469
1983	51.2570991516113
1984	50.8903007507324
1985	50.602970123291
1986	49.8934097290039
1987	50.7017784118652
1988	52.0179290771484
1989	53.6844291687012
1990	52.5642204284668
1992	54.43798828125
1996	61.6446418762207
1997	64.1577911376953
1998	68.7123489379883
1999	72.245246887207
2000	78.4995803833008
2001	79.5265808105469
2002	80.8960571289062
2003	83.2985763549805
2004	83.9206237792969
2005	87.0393829345703
2006	85.6991882324219
2007	87.0263900756836
2008	87.0452728271484
2009	88.0555725097656
2010	88.8188018798828
2011	91.9217834472656
2012	92.3053970336914
2013	94.2857437133789
2014	96.8766632080078
2015	94.6174087524414
2016	95.1192321777344
2017	93.5423202514648
2018	93.4170684814453
2019	95.7219009399414
2020	92.1774673461914