Year	% gross
1970	100.297157287598
1975	103.189598083496
1977	91.3148880004883
1978	85.6235198974609
1979	86.3846817016602
1981	86.8708190917969
1982	84.6667785644531
1986	91.4388809204102
1987	90.5673294067383
1988	87.8341369628906
1989	110.292922973633
1990	106.887573242188
1991	104.747467041016
1994	101.223518371582
1995	100.725646972656
1997	98.7422790527344
1998	96.5647888183594
1999	95.265251159668
2000	89.8279724121094
2001	90.8689270019531
2002	93.3286209106445
2003	95.1319427490234
2004	96.8669891357422
2005	97.6283874511719
2006	99.7244720458984
2007	103.162117004395
2008	104.998100280762
2009	106.332817077637
2010	107.648483276367
2011	108.391960144043
2012	109.080718994141
2013	108.892738342285
2014	109.028793334961
2015	111.678253173828
2016	107.619003295898
2017	104.854881286621
2018	101.95011138916
2019	101.256492614746
2020	99.7352600097656
2021	98.1153106689453