Year	% gross
1970	81.0930633544922
1971	80.5339279174805
1972	82.3825607299805
1973	81.689582824707
1974	83.9663391113281
1975	83.7180328369141
1976	86.3883209228516
1977	85.8988265991211
1978	88.4510498046875
1979	94.1576232910156
1980	95.2399673461914
1981	93.5637130737305
1982	99.1252365112305
1983	100.810478210449
1984	102.159820556641
1985	102.694107055664
1986	106.213317871094
1988	105.48429107666
1990	102.991477966309
1991	102.844009399414
1992	106.106307983398
1993	107.111671447754
1994	106.961822509766
1995	105.040000915527
1996	106.422790527344
1997	106.606590270996
1998	106.958267211914
1999	105.113952636719
2000	104.084060668945
2003	108.066452026367
2004	106.412147521973
2005	102.495376586914
2006	105.638130187988
2007	100.794296264648
2008	101.19270324707
2009	99.2089767456055
2010	99.1288909912109
2011	97.3792037963867
2012	93.9843215942383
2014	91.254997253418
2015	90.1559982299805
2016	89.7389984130859
2017	88.8010025024414
2018	89.1309967041016
2019	88.2949981689453
2020	86.9550018310547
2021	84.7809982299805