Year	% gross
1970	13.0108404159546
1971	7.90064001083374
1972	8.66633987426758
1973	11.0096397399902
1975	12.8797798156738
1976	13.8096904754639
1977	14.6225004196167
1978	14.7288703918457
1979	17.8538703918457
1980	18.982780456543
1981	20.8150997161865
1982	21.2739601135254
1983	23.7704696655273
1984	24.1944808959961
1985	24.4901103973389
1986	25.3797798156738
1987	27.6229190826416
1988	28.5382900238037
1989	28.0645198822021
1990	27.8569602966309
1991	26.85910987854
1992	28.4577102661133
1993	29.3756103515625
1994	32.1080284118652
1996	33.2092590332031
1997	34.3677215576172
1998	34.6137809753418
1999	33.5864601135254
2000	33.2954483032227
2001	34.7807693481445
2002	36.0867309570312
2003	36.9545516967773
2004	39.4707412719727
2005	41.907341003418
2006	43.2669296264648
2007	47.2402381896973
2008	51.0760688781738
2009	56.3642616271973
2010	61.9749183654785
2011	64.746696472168
2012	66.8282470703125
2013	64.5085678100586
2014	65.3412628173828
2015	66.7606811523438
2016	64.6872634887695
2017	68.3570175170898