Year	% gross
1971	66.0620803833008
1972	71.6856384277344
1973	73.2796401977539
1974	74.2308197021484
1975	75.9582290649414
1976	78.8260726928711
1977	84.4571685791016
1978	85.92431640625
1979	84.3453521728516
1980	84.7129516601562
1981	83.2299499511719
1982	84.8899536132812
1983	84.7625198364258
1984	83.4876937866211
1985	80.5824508666992
1986	78.1823196411133
1987	74.1742782592773
1988	73.4150390625
1989	73.1572799682617
1990	73.5651779174805
1991	104.561477661133
1992	70.3798522949219
1993	75.9394378662109
1994	86.5135803222656
1995	88.0885925292969
1996	90.1786804199219
1997	91.6975173950195
1998	93.1912536621094
1999	94.1751327514648
2000	97.6961364746094
2001	99.8540725708008
2002	104.374702453613
2003	107.717903137207
2004	108.967529296875
2005	110.74104309082
2006	108.937118530273
2007	110.195472717285
2008	106.735832214355
2009	105.613586425781
2010	103.976058959961
2011	104.581970214844
2012	101.502098083496
2013	98.8870086669922
2014	97.3021087646484
2015	104.971778869629