Year	% gross
1970	51.4293594360352
1975	60.478931427002
1976	62.2734107971191
1977	62.8878707885742
1978	65.9931869506836
1979	67.4606018066406
1980	72.3970718383789
1994	68.3729934692383
1995	72.7826538085938
1996	71.7952117919922
1997	73.82568359375
1998	72.7432632446289
1999	74.3768615722656
2000	72.7241973876953
2001	73.8817977905273
2002	74.8201904296875
2003	75.6482467651367
2004	75.6828079223633
2005	75.1441116333008
2006	74.1977691650391
2007	73.0399703979492
2009	74.376953125
2010	76.7830276489258
2011	76.0178833007812
2012	77.3607864379883
2014	80.7584228515625
2015	80.7512893676758
2016	81.2044372558594