Year	% gross
1971	99.7616271972656
1972	100.256576538086
1973	101.409889221191
1974	104.609443664551
1975	106.500450134277
1976	108.372261047363
1977	107.05785369873
1978	103.115432739258
1979	101.235900878906
1980	101.296821594238
1981	103.077377319336
1982	105.50390625
1983	107.758422851563
1984	110.167587280273
1985	111.715110778809
1986	111.615982055664
1987	107.819091796875
1988	104.671653747559
1989	102.645477294922
1990	103.382957458496
1991	104.453628540039
1992	110.995376586914
1993	114.278427124023
1994	117.10880279541
1995	118.214431762695
1996	117.022857666016
1999	108.535453796387
2000	109.673736572266
2001	110.631286621094
2002	112.500839233398
2003	114.813591003418
2004	115.836929321289
2005	119.412788391113
2006	118.889846801758
2007	118.01522064209
2008	117.933059692383
2009	118.35961151123
2010	119.375228881836
2011	120.612823486328
2012	120.085121154785
2013	118.835487365723
2014	118.244087219238
2015	117.014228820801
2016	116.095588684082
2017	115.145317077637
2018	114.035659790039
2019	113.510673522949
2020	112.43090057373