Year	% gross
1970	68.1687088012695
1971	68.9359283447266
1972	69.6500396728516
1973	71.0345001220703
1974	73.6395492553711
1975	74.3953323364258
1976	76.1086807250977
1977	76.7202377319336
1978	76.9438781738281
1979	77.1005325317383
1980	77.9776000976563
1981	78.9252395629883
1982	80.0204010009766
1983	81.5682601928711
1984	83.3174133300781
1985	84.5380401611328
1986	85.7215423583984
1987	85.831787109375
1988	85.36181640625
1989	85.0706634521484
1990	86.2174911499023
1991	87.7940673828125
1992	88.3364410400391
1993	89.2524566650391
1994	90.2011032104492
1995	89.0764083862305
1996	90.7678070068359
1997	92.4885406494141
1998	93.0507736206055
1999	93.5164108276367
2000	94.3992767333984
2001	95.2445907592773
2002	96.0218276977539
2003	96.996223449707
2004	97.6429595947266
2005	98.9991073608398
2006	99.08447265625
2007	98.9955291748047
2008	99.1400985717773
2009	99.1474227905273
2010	99.4499816894531
2011	99.7076797485352
2012	99.8997268676758
2013	100.325119018555
2014	99.6434783935547
2015	99.8189926147461
2016	100.105308532715
2017	99.5910110473633
2018	99.7822723388672
2019	100.591270446777
2020	101.545097351074