Year	% gross
1970	117.686408996582
1971	110.862182617188
1972	110.298141479492
1973	108.502342224121
1974	110.220886230469
1975	95.9148788452148
1976	96.049919128418
1977	96.2838668823242
1978	95.5908432006836
1979	94.2427368164062
1980	91.0766296386719
1981	90.7944717407227
1982	91.2401885986328
1983	90.0782699584961
1984	89.5389785766602
1986	90.671516418457
1987	88.9219589233398
1988	94.1013336181641
1991	92.2707214355469
1999	99.0923614501953
2000	99.0009918212891
2001	99.301643371582
2002	99.5838928222656
2003	98.9921875
2004	98.6015167236328
2005	99.836311340332
2006	99.4371719360352
2007	99.5190734863281
2008	99.6457977294922
2010	98.4847564697266
2011	97.1075973510742
2012	98.9838333129883
2013	97.8672332763672
2014	97.51416015625
2015	97.5717315673828
2016	97.9009094238281
2017	97.308219909668
2018	96.7865219116211
2019	98.1641464233398
2020	98.6141967773438
2021	98.5407333374023