Year	% gross
1970	103.296516418457
1971	104.276168823242
1972	106.812797546387
1973	107.270797729492
1974	107.561126708984
1975	109.030258178711
1976	108.116546630859
1977	109.32926940918
1978	110.181823730469
1979	106.721588134766
1980	106.788528442383
1981	113.09797668457
1982	113.032272338867
1983	112.144729614258
1984	106.321876525879
1985	106.885581970215
1986	107.216743469238
1987	105.627738952637
1988	102.725341796875
1989	102.438949584961
1990	104.433380126953
1991	105.417831420898
1992	104.326728820801
1993	103.464393615723
1994	102.612152099609
1995	102.332221984863
1996	102.157020568848
1997	102.617668151855
1998	102.997039794922
1999	103.299697875977
2000	103.503753662109
2001	103.658668518066
2002	104.012397766113
2003	103.9658203125
2004	103.865287780762
2005	103.152236938477
2006	102.536796569824
2007	101.526290893555
2008	101.221687316895
2009	101.216888427734
2010	101.271148681641
2011	101.627586364746
2012	102.241088867188
2013	101.136978149414
2014	101.639251708984
2015	101.358818054199
2016	101.319442749023
2017	100.119659423828
2018	100.299301147461
2019	99.2613067626953
2020	98.686653137207
2021	104.12020111084