Year	% gross
1971	100.489128112793
1972	98.1848602294922
1973	96.0873336791992
1974	93.9026718139648
1975	90.9451599121094
1976	91.4820709228516
1977	91.5994567871094
1978	92.8584213256836
1979	93.2099380493164
1980	94.1864013671875
1981	96.05859375
1982	99.2172393798828
1983	100.691268920898
1984	101.919052124023
1985	103.582000732422
1986	103.908073425293
1987	106.392936706543
1988	106.210357666016
1989	104.847709655762
1990	97.4002075195312
1991	95.2235794067383
1992	93.4384384155273
1993	92.8395767211914
1994	93.4214019775391
1995	94.7320709228516
1996	97.6761474609375
1997	98.8522796630859
1998	100.631523132324
1999	102.205337524414
2000	103.496070861816
2001	104.177856445312
2002	108.58283996582
2003	110.496520996094
2004	110.641036987305
2005	110.273193359375
2006	108.14119720459
2007	105.626419067383
2008	103.891967773438
2009	101.780372619629
2010	101.14933013916
2011	100.893112182617
2012	99.9967193603516
2013	99.1244964599609
2014	99.2087173461914
2015	98.3467864990234
2016	96.5474624633789
2017	94.9153366088867
2018	93.37548828125
2019	90.8757171630859
2020	88.7948837280273
2021	87.1739273071289