Year	% gross
1970	6.81883001327515
1971	7.43326997756958
1972	7.02644014358521
1973	8.01593017578125
1974	9.89099979400635
1975	10.8395500183105
1976	10.0625495910645
1978	11.5727796554565
1980	11.4277400970459
1981	10.3907499313354
1982	12.7762899398804
1983	13.8039102554321
1984	13.8188695907593
1987	15.6464099884033
1988	16.6538696289063
1991	19.4948692321777
1992	22.6413192749023
1993	26.1281299591064
1994	27.0039596557617
1995	30.3815307617188
1996	33.8168296813965
1997	39.6924705505371
1998	39.7135314941406
1999	42.2225494384766
2000	44.163761138916
2001	46.7451400756836
2002	50.3056106567383
2003	52.9262886047363
2004	56.1256713867188
2005	56.4910087585449
2006	57.5277099609375
2007	57.1910781860352
2008	58.0264511108398
2009	57.9408416748047
2010	62.397518157959
2011	62.470588684082
2012	62.585620880127
2013	63.8239707946777
2014	65.3474578857422