Year	% gross
1970	45.417049407959
1971	45.431770324707
1972	46.2219505310059
1973	48.5992317199707
1974	51.4982795715332
1975	53.8170013427734
1976	54.7162208557129
1977	56.2153396606445
1978	58.164249420166
1979	60.1361694335938
1980	61.7967185974121
1981	62.3568305969238
1982	60.7332305908203
1983	59.2878494262695
1984	57.8135986328125
1985	58.2508697509766
1986	58.7029609680176
1987	59.5833396911621
1988	60.9910888671875
1989	62.2236785888672
1990	61.2153396606445
1991	58.3814506530762
1992	54.1591415405273
1993	52.9099197387695
1994	51.9011993408203
1995	53.8711090087891
1996	55.4114189147949
1997	56.7465286254883
1998	58.1984901428223
1999	61.2551193237305
2000	62.4206581115723
2001	63.1045608520508
2002	64.4673233032227
2003	66.9072570800781
2004	68.7345809936523
2005	70.8937072753906
2006	72.3722381591797
2007	73.8636016845703
2008	74.5879669189453
2009	76.1975402832031
2010	78.3278198242188
2011	80.3095321655273
2012	81.8414764404297
2013	83.7600708007813
2014	83.9283676147461
2015	83.9301605224609
2016	83.7140121459961
2017	84.566291809082
2018	88.8734817504883
2019	92.965202331543
2020	93.9627838134766