Year	% gross
1970	101.450141906738
1971	103.920761108398
1972	105.73193359375
1973	108.181800842285
1974	108.389198303223
1975	108.031051635742
1976	107.100608825684
1977	106.173477172852
1978	105.531730651855
1979	103.796051025391
1980	103.63655090332
1981	103.982849121094
1983	103.515640258789
1984	103.509498596191
1985	103.513687133789
1986	102.554229736328
1987	100.74633026123
1991	100.080390930176
1992	99.8667297363281
1994	101.364730834961
1995	100.22981262207
1996	98.8817977905273
1997	99.7153778076172
1998	100.506813049316
1999	100.19702911377
2000	99.5651473999023
2001	100.623931884766
2002	100.195541381836
2003	100.088241577148
2004	101.039352416992
2006	99.439811706543
2007	94.5077667236328
2008	94.1115493774414
2009	93.1980133056641
2011	93.5630569458008
2012	94.6015930175781
2013	95.9540023803711
2014	96.0210037231445
2015	98.0989990234375
2016	98.6500015258789
2017	100.934997558594
2018	103.446998596191
2019	111.436157226562
2020	111.690002441406
2021	110.815002441406
2022	108.043998718262