Year	% gross
1970	13.0184602737427
1971	13.0938396453857
1972	13.2713003158569
1973	13.447190284729
1974	13.750599861145
1975	14.4997501373291
1976	15.0200796127319
1977	15.604510307312
1978	16.3140602111816
1979	16.6836700439453
1980	17.5754795074463
1981	17.4174194335938
1982	17.5350208282471
1983	17.7785797119141
1984	18.175220489502
1985	18.3846702575684
1986	18.8957996368408
1987	19.1174201965332
1988	19.823600769043
1989	19.6976299285889
1990	19.4550495147705
1991	19.5734195709229
1992	19.3658199310303
1993	19.0413799285889
1994	19.338249206543
1995	19.5347309112549
1996	19.6139392852783
1997	16.1441898345947
1998	17.9801902770996
1999	19.2962894439697
2000	21.0957794189453
2001	22.3438892364502
2002	23.2302303314209
2003	25.1582508087158
2004	27.5492305755615
2005	30.2278308868408
2006	34.0735397338867
2007	36.1035614013672
2008	38.1600112915039
2009	40.3219299316406
2010	42.4095611572266
2011	45.5980682373047
2012	48.4089889526367
2013	51.3742904663086
2014	50.3452301025391
2015	52.6063613891602
2016	54.6154403686523
2017	56.8956985473633
2018	57.5239601135254
2019	58.7856483459473
2020	59.072078704834