Year	% gross
1971	12.3765296936035
1972	13.6393203735352
1973	19.3162403106689
1974	20.6553592681885
1975	22.076000213623
1976	24.9288597106934
1977	25.2194805145264
1978	27.2564296722412
1979	25.1319198608398
1980	26.004940032959
1981	25.3823795318604
1982	25.1386909484863
1983	24.8741207122803
1984	25.7862892150879
1985	26.8239994049072
1986	28.4620208740234
1987	29.5593299865723
1988	31.068920135498
1989	33.1608695983887
1990	34.5054016113281
1991	35.7718811035156
1992	37.5704002380371
1993	38.7177886962891
1994	41.6383895874023
1995	41.5711898803711
1996	43.0498886108398
1997	45.595630645752
1998	47.7561492919922
1999	50.1824188232422
2000	53.6866607666016
2001	56.6614418029785
2002	58.3453483581543
2003	59.9459686279297
2004	60.8302307128906
2005	61.5280685424805
2006	62.1047286987305
2007	62.1660003662109
2008	62.2284812927246
2009	63.9721183776855
2010	68.6996612548828
2011	72.6763305664062
2012	75.0640411376953
2013	77.2431564331055
2014	80.0947265625
2015	80.9930191040039
2016	81.8702621459961
2017	83.5683212280273
2018	83.391242980957
2019	82.0160980224609
2020	81.020622253418
2021	83.7875823974609