Year	% gross
1970	11.1649303436279
1971	11.2342195510864
1972	11.4147796630859
1973	11.603949546814
1974	11.9652004241943
1975	12.7520303726196
1976	13.2731199264526
1977	13.8625001907349
1978	14.6184701919556
1979	15.0546598434448
1980	16.0362701416016
1981	15.7734699249268
1982	16.0557594299316
1983	16.1122398376465
1984	16.4476890563965
1985	16.506799697876
1986	17.0816707611084
1987	17.3143405914307
1988	17.9337196350098
1989	17.9151191711426
1990	17.7473602294922
1991	17.7601299285889
1992	17.5203399658203
1993	17.1255207061768
1994	17.4064407348633
1995	17.6849594116211
1996	17.7943992614746
1997	14.8367900848389
1998	16.7513103485107
1999	17.8555297851563
2000	19.7108707427979
2001	21.2037105560303
2002	22.7310695648193
2003	24.698299407959
2004	27.3092803955078
2005	30.1754302978516
2006	33.9923515319824
2007	35.990291595459
2008	38.1472015380859
2009	40.2413711547852
2010	42.6579513549805
2011	46.0132217407227
2012	48.7880706787109
2013	51.6998100280762
2014	50.6663703918457
2015	52.7869415283203
2016	54.5339584350586
2017	56.7549705505371
2018	57.4182586669922
2019	58.5403213500977
2020	57.8818511962891