Year	% gross
1992	100.046859741211
1993	102.513931274414
1994	102.222290039062
1995	102.147727966309
1996	102.244117736816
1997	102.691352844238
1998	104.346672058105
1999	104.828308105469
2000	105.016380310059
2001	106.292358398438
2002	104.565582275391
2003	103.501609802246
2004	103.52906036377
2005	103.414039611816
2006	104.290412902832
2007	104.65518951416
2008	104.8662109375
2009	104.606971740723
2010	104.100631713867
2011	104.249351501465
2012	104.018447875977
2013	103.312103271484
2014	102.334182739258
2015	102.448661804199
2016	101.37281036377
2017	101.625709533691
2018	102.604873657227
2019	102.551483154297
2020	101.938171386719
2021	101.421569824219