Year	% gross
1970	96.9783630371094
1971	97.7923812866211
1972	101.066467285156
1973	100.525779724121
1974	101.964561462402
1975	103.622978210449
1976	102.385231018066
1977	102.010482788086
1978	101.158126831055
1979	100.421539306641
1980	100.386726379395
1981	99.3596115112305
1982	99.1661911010742
1983	100.251007080078
1984	101.477127075195
1985	101.513061523438
1986	101.235153198242
1987	100.23282623291
1988	99.9689636230469
1989	99.8152770996094
1990	99.180793762207
1991	98.8342514038086
1992	99.3599014282227
1993	101.455520629883
1994	102.066589355469
1995	102.481430053711
1996	98.4746398925781
1997	101.402702331543
1998	100.423233032227
1999	97.2697982788086
2000	96.1782608032227
2001	98.5447998046875
2002	99.5239486694336
2003	100.412117004395
2004	100.613471984863
2005	101.122009277344
2006	101.261047363281
2007	99.8571166992188
2008	101.08918762207
2009	101.036399841309
2010	103.436729431152
2011	103.693283081055
2012	103.604881286621
2013	104.735168457031
2014	104.352958679199
2015	104.36833190918
2016	105.139892578125
2017	106.046241760254
2018	105.718719482422
2019	106.715408325195
2020	105.422210693359
2021	105.750457763672