Year	% gross
1970	18.2428398132324
1971	18.6896190643311
1972	18.8400897979736
1973	19.2270393371582
1974	19.832389831543
1975	21.3286209106445
1976	22.0558605194092
1977	22.6940002441406
1978	24.0231704711914
1981	28.2317199707031
1982	30.4451599121094
1983	34.0125312805176
1984	34.3443794250488
1986	42.2039604187012
1987	47.7644195556641
1988	49.8115196228027
1989	49.7160797119141
1990	47.1402587890625
1991	45.344799041748
1992	44.5281181335449
1993	44.1304397583008
1994	45.0727005004883
1995	47.9068908691406
1996	50.6944007873535
1997	54.4479789733887
1998	54.7715606689453
1999	55.1420593261719
2000	56.1876792907715
2001	56.8619689941406
2002	58.3996086120605
2003	61.611270904541
2004	63.9592704772949
2005	62.6105499267578
2006	65.7089309692383
2007	73.1319808959961
2008	71.4267272949219
2009	75.8255615234375
2010	76.9965133666992
2011	79.5367202758789
2012	81.5296478271484
2013	84.5079116821289
2014	85.2628936767578
2015	89.543571472168
2016	89.1707077026367
2017	91.9919891357422
2018	94.1759185791016
2019	95.7839965820312
2020	98.0439987182617
2021	99.0970001220703
2022	98.9720001220703