Year	% gross
1974	41.950080871582
1975	46.7772483825684
1976	56.0940589904785
1977	56.7992401123047
1978	56.2369499206543
1979	58.7257385253906
1980	59.6164894104004
1981	55.7958106994629
1982	58.2010917663574
1983	60.8550109863281
1984	59.4365882873535
1985	58.2429389953613
1986	59.1922912597656
1987	56.9810905456543
1988	60.1612014770508
1989	59.4566497802734
1990	59.7042198181152
1991	60.7143402099609
1992	62.7893409729004
1993	65.5998306274414
1994	67.9981231689453
1995	68.9711837768555
1996	69.7796936035156
1997	70.9092483520508
1998	72.4793701171875
1999	74.0171966552734
2000	76.2677917480469
2001	73.1464004516602
2002	77.283561706543
2003	76.9490280151367
2004	83.0561676025391
2005	85.0370178222656
2006	83.4259414672852
2007	82.3423309326172
2008	82.7795028686523
2009	84.7352066040039
2010	82.2718887329102
2011	82.9548873901367
2012	84.3619537353516
2013	88.0370788574219
2014	80.6003570556641
2015	84.0031661987305
2016	76.8975219726563
2017	79.2273712158203
2018	78.7661895751953
2019	81.2182388305664
2020	71.9978866577148