Year	% gross
1971	102.17561340332
1972	102.557777404785
1973	101.818946838379
1974	101.670181274414
1975	101.775390625
1976	101.477363586426
1977	103.031860351562
1978	101.317749023438
1979	101.455383300781
1980	101.646507263184
1981	100.484718322754
1982	100.262161254883
1983	100.612861633301
1984	99.9461517333984
1985	99.5299682617188
1986	100.975257873535
1987	99.442756652832
1988	98.8646926879883
1989	98.4107513427734
1990	98.4695129394531
1991	99.0513000488281
1992	101.489318847656
1993	102.890480041504
1994	102.562057495117
1995	102.600708007812
1996	102.103172302246
1997	101.295448303223
1998	100.813667297363
1999	100.97679901123
2000	101.270492553711
2001	101.86499786377
2002	102.157829284668
2003	101.80647277832
2004	102.497276306152
2005	101.777389526367
2006	101.726783752441
2007	102.035339355469
2008	101.526191711426
2009	100.842010498047
2010	100.256912231445
2011	100.182289123535
2012	99.8584976196289
2013	100.094581604004
2014	100.424949645996
2015	100.440399169922
2016	99.9959335327148
2017	100.728820800781
2018	100.999420166016
2019	101.191581726074
2020	101.103019714355
2021	101.30931854248
2022	100.384559631348