Year	% gross
1970	75.3126373291016
1971	76.0019302368164
1972	78.8730621337891
1973	82.408332824707
1974	85.0245971679688
1975	86.0322723388672
1976	86.5595092773438
1977	87.7372512817383
1978	88.4133377075195
1979	89.6683807373047
1980	91.8747100830078
1981	94.2603912353516
1982	94.9830093383789
1983	94.3985137939453
1984	94.5333023071289
1985	94.4047927856445
1986	93.13818359375
1987	93.1559600830078
1988	92.8223724365234
1989	92.2204132080078
1990	93.9439086914062
1991	93.9380035400391
1992	94.4983520507812
1993	94.2879791259766
1994	95.1010818481445
1995	97.6345672607422
1996	95.6094436645508
1997	95.6377182006836
1998	94.5326232910156
1999	95.5352783203125
2000	94.6860198974609
2001	94.0437927246094
2002	92.4481430053711
2003	94.3917236328125
2004	99.6453704833984
2005	102.756462097168
2006	108.103492736816
2007	111.266342163086
2009	112.687576293945
2010	118.136032104492
2011	116.398902893066
2012	117.668228149414
2013	117.719100952148
2014	118.693748474121
2015	118.753692626953
2016	117.246673583984
2017	116.12956237793
2018	115.910346984863
2019	115.35489654541