Year	% gross
1970	105.078239440918
1971	105.039772033691
1972	104.857681274414
1973	104.345611572266
1974	104.56330871582
1975	104.086212158203
1976	104.146133422852
1977	103.785400390625
1978	103.28369140625
1979	102.919212341309
1980	102.600952148438
1981	102.260559082031
1982	102.535308837891
1983	102.739028930664
1984	103.490089416504
1985	103.616798400879
1986	103.943466186523
1987	104.197898864746
1988	104.514343261719
1989	103.912452697754
1990	103.815277099609
1991	103.981147766113
1992	103.454689025879
1993	103.266952514648
1994	102.991912841797
1995	102.320007324219
1996	102.089332580566
1997	102.143280029297
1998	103.502731323242
1999	103.929298400879
2000	103.962959289551
2001	104.954452514648
2002	105.645027160645
2003	104.447341918945
2004	103.787376403809
2005	102.728202819824
2006	102.28539276123
2007	102.033828735352
2008	101.629287719727
2009	101.18058013916
2010	101.258140563965
2011	101.18531036377
2012	101.203811645508
2013	102.414779663086
2014	101.449821472168
2015	100.927131652832
2016	100.532661437988
2017	100.31925201416
2018	100.884307861328
2019	101.16333770752
2020	100.685836791992
2021	101.100608825684
2022	100.960960388184