Year	% gross
1970	23.2655296325684
1971	23.352840423584
1972	24.5090808868408
1973	25.3676700592041
1974	25.9263706207275
1975	27.4682693481445
1976	29.2805194854736
1977	29.276029586792
1978	29.9287700653076
1979	29.8187599182129
1980	30.2858009338379
1981	30.9749507904053
1982	31.5798797607422
1983	31.9940700531006
1984	32.5047492980957
1985	32.9719390869141
1986	33.3538513183594
1987	34.0977783203125
1988	35.0686798095703
1989	36.0064392089844
1990	37.0266609191895
1991	38.2481994628906
1992	40.0465507507324
1993	42.3585586547852
1994	44.5098991394043
1995	45.8875617980957
1996	47.3321990966797
1997	48.3928413391113
1998	47.9729118347168
1999	49.538890838623
2000	50.9937286376953
2001	52.6953887939453
2002	54.455249786377
2003	56.305549621582
2004	57.7708396911621
2005	59.375659942627
2006	60.5940284729004
2007	61.5765686035156
2008	62.3910217285156
2009	63.7440795898438
2010	65.6428985595703
2011	67.092170715332
2012	68.4967422485352
2013	69.8488616943359
2014	70.8922805786133
2015	72.0554580688477
2016	73.9723281860352
2017	74.8282775878906
2018	75.5273971557617
2019	76.4382019042969
2020	77.2416687011719
2021	78.6461410522461
2022	78.7010192871094