Year	% gross
1980	99.0287628173828
1981	99.2076034545898
1982	100.180549621582
1983	100.987129211426
1984	102.894508361816
1985	103.46118927002
1986	104.20287322998
1987	104.739776611328
1988	105.909057617188
1989	104.940040588379
1990	105.083053588867
1991	105.874870300293
1992	104.225799560547
1993	102.770751953125
1994	101.39729309082
1995	100.100379943848
1996	99.203727722168
1997	100.059196472168
1998	101.588851928711
1999	102.740493774414
2000	104.037788391113
2001	106.107566833496
2002	107.999786376953
2003	105.53914642334
2004	103.111442565918
2005	100.213729858398
2006	99.803596496582
2007	99.8759994506836
2008	99.1101913452148
2009	98.7490615844727
2010	99.3906707763672
2011	99.7057189941406
2012	99.6241836547852
2013	101.86653137207
2014	101.67456817627
2015	100.626121520996
2016	100.154586791992
2017	99.1245727539062
2018	100.38436126709
2019	100.995140075684
2020	100.673851013184
2021	100.253807067871
2022	99.9485702514648