Year	% gross
1970	0.469049990177155
1971	0.46764999628067
1972	0.535099983215332
1974	0.541239976882935
1975	0.514750003814697
1976	0.47172999382019
1977	0.563059985637665
1978	0.592119991779327
1979	0.522560000419617
1980	0.48555999994278
1981	0.535369992256165
1982	0.583639979362488
1985	0.732699990272522
1986	0.771870017051697
1987	0.841539978981018
1988	0.913600027561188
1989	0.915130019187927
1990	1.04489994049072
1991	1.22169995307922
1992	1.19265997409821
1993	1.2978800535202
1994	1.44410002231598
1995	1.54847002029419
1996	1.7778400182724
1999	1.94971001148224
2000	2.61258006095886
2001	2.8538498878479
2002	3.54973006248474
2003	3.78515005111694
2004	3.66168999671936
2006	3.55641007423401
2008	3.79364991188049
2009	4.17582988739014
2010	3.89966988563538
2011	4.35145998001099
2012	3.72024011611938
2013	4.02500009536743
2014	4.57403993606567
2015	4.91599988937378
2016	4.75600004196167