Year	% gross
1971	2.35227990150452
1972	2.54151010513306
1973	2.48770999908447
1974	4.63680982589722
1975	9.77046966552734
1976	18.8799705505371
1977	22.0132102966309
1978	23.6944007873535
1982	16.3494091033936
1983	13.8129796981812
1984	14.419059753418
1985	5.56798982620239
1986	7.16800022125244
1987	7.7676100730896
1988	8.76953029632568
1989	10.0709495544434
1990	12.0475997924805
1991	12.4856700897217
1992	13.7497997283936
1993	9.08885955810547
1994	7.25174999237061
1995	7.92433023452759
1997	11.6081695556641
1998	16.4532508850098
1999	14.8182497024536
2000	18.1189708709717
2001	21.7229900360107
2002	25.7332897186279
2003	32.4725494384766
2004	36.133731842041
2005	42.3401298522949
2006	47.8071594238281
2007	48.9331283569336
2008	51.8886985778809
2009	39.5065307617188
2010	38.8924407958984
2011	38.8104095458984
2012	34.5315093994141
2013	38.3352584838867
2014	43.5845413208008
2015	52.5051689147949
2016	53.0468406677246
2017	62.0474472045898
2018	67.8545303344727
2019	73.7787094116211
2020	71.3301620483398