Year	% gross
1970	51.1030311584473
1971	52.2417907714844
1972	53.7028312683105
1973	55.1586608886719
1974	57.710880279541
1975	59.6593894958496
1976	61.6917686462402
1977	66.4568786621094
1978	71.8325729370117
1979	77.417106628418
1980	79.7157592773438
1981	81.5029525756836
1982	82.9221801757812
1983	82.6783981323242
1984	81.9533309936523
1985	79.0925674438477
1986	76.1645278930664
1987	74.0595703125
1988	73.1728973388672
1989	71.8752136230469
1990	71.7822875976562
1991	73.1182632446289
1992	72.9070129394531
1993	74.3696365356445
1994	74.3136901855469
1995	74.692253112793
1996	71.6668090820312
1997	75.9595489501953
1998	76.6825790405273
1999	77.5307006835938
2000	79.7102127075195
2001	81.6244812011719
2002	85.8773727416992
2003	89.8100662231445
2004	92.1318511962891
2005	93.3538436889648
2006	94.9315567016602
2007	94.9038925170898
2008	95.6437835693359
2009	96.1298294067383
2010	96.2787170410156
2011	97.4236373901367
2012	98.5171203613281
2013	98.6553421020508
2014	97.6334075927734
2015	96.0615997314453
2016	95.6248397827148
2017	96.0647430419922
2018	96.8028106689453
2019	97.5674285888672
2020	98.1318511962891
2021	98.4935607910156
2022	98.569206237793