Year	% gross
1971	29.5264091491699
1972	30.5456790924072
1973	33.5083084106445
1974	35.5165710449219
1975	35.8837089538574
1976	35.5656585693359
1977	39.2094497680664
1978	42.4702987670898
1979	46.6572608947754
1980	48.9444885253906
1981	50.4565505981445
1982	51.8126487731934
1983	51.7300796508789
1984	52.5297317504883
1985	53.5248985290527
1986	53.778881072998
1987	53.5349617004395
1988	55.005729675293
1989	54.1940116882324
1990	54.195140838623
1991	53.9529418945313
1992	56.3034706115723
1993	59.9080200195313
1994	61.9027786254883
1995	63.5202903747559
1996	62.9791603088379
1997	64.7685775756836
1998	67.8298416137695
1999	66.6105422973633
2000	68.2548522949219
2001	68.7698287963867
2002	66.9865112304688
2003	65.8268508911133
2004	64.8587875366211
2005	65.5017013549805
2006	66.0371932983398
2007	65.7631072998047
2010	74.6417922973633
2011	77.7021636962891
2012	77.165412902832
2013	76.5111770629883
2014	73.8799514770508
2015	75.418830871582
2016	73.9062271118164
2017	74.8690490722656
2018	77.8881912231445
2019	84.0532836914063
2020	93.6637573242188