Year	% gross
1971	76.3227767944336
1972	77.5897827148438
1973	79.245231628418
1974	79.8226013183594
1975	81.666748046875
1976	84.3994598388672
1977	89.2566680908203
1978	91.2138366699219
1979	88.7058868408203
1980	87.7656326293945
1981	85.373161315918
1982	86.1874618530273
1983	85.4728012084961
1984	84.0307312011719
1985	81.3390579223633
1986	78.7987213134766
1987	74.9900131225586
1988	73.9460220336914
1989	73.5588836669922
1990	73.9809875488281
1991	107.348907470703
1992	70.791389465332
1993	75.7312469482422
1994	86.3036270141602
1995	86.2886428833008
1996	90.6320724487305
1997	92.0612716674805
1998	93.4049224853516
1999	94.3826217651367
2000	97.1785507202148
2001	99.1064834594727
2002	103.885429382324
2003	106.225738525391
2004	107.467758178711
2005	110.183616638184
2006	107.860626220703
2007	109.486450195312
2008	105.853157043457
2009	104.783432006836
2010	103.456069946289
2011	104.047218322754
2012	100.401550292969
2013	97.4166793823242
2014	95.9877319335938
2015	101.933448791504