Year	% gross
1971	79.8429870605469
1972	76.9122467041016
1973	75.8827362060547
1974	77.3095169067383
1975	78.8061294555664
1976	80.3210906982422
1977	81.3671035766602
1978	82.7878112792969
1979	84.2186279296875
1980	85.135627746582
1981	86.1004333496094
1982	86.0724716186523
1983	86.3414001464844
1984	86.0784912109375
1985	86.5035705566406
1986	86.4794006347656
1987	85.7499771118164
1988	85.8488998413086
1989	85.5631408691406
1990	85.640380859375
1991	84.9471282958984
1992	83.4691925048828
1994	89.555419921875
1995	91.5654907226562
1996	94.2135696411133
1997	96.6096725463867
1998	91.9914932250977
1999	93.789680480957
2000	95.7018127441406
2001	97.9196319580078
2002	99.6772232055664
2003	101.86319732666
2004	96.3408508300781
2005	97.7772979736328
2006	98.0710296630859
2007	98.0491790771484
2008	99.0317001342773
2009	100.247993469238
2010	102.690132141113
2011	104.101249694824
2012	102.074668884277
2013	106.71070098877
2014	105.484100341797
2015	104.229927062988
2016	104.484680175781
2017	104.250389099121
2018	103.969413757324
2019	102.725891113281
2020	102.245399475098
2021	99.8163909912109