Year	% gross
1971	108.889511108398
1972	108.460090637207
1973	107.458290100098
1974	106.954307556152
1975	106.058441162109
1976	105.822120666504
1977	105.290100097656
1978	104.502449035645
1979	103.549461364746
1980	101.702110290527
1981	102.055976867676
1982	100.88745880127
1983	100.763046264648
1984	100.408782958984
1985	100.119522094727
1986	99.2656784057617
1987	96.4836502075195
1988	97.2722702026367
1989	96.6405029296875
1990	95.9240570068359
1991	95.7592163085938
1992	95.7368392944336
1993	95.7746276855469
1994	96.5502395629883
1995	98.659553527832
1996	97.2550430297852
1997	97.3056106567383
1998	99.054817199707
1999	100.089622497559
2000	101.218269348145
2001	100.939361572266
2002	102.966598510742
2003	102.926872253418
2004	103.721893310547
2005	102.812538146973
2006	101.98477935791
2007	100.579162597656
2010	100.898872375488
2011	99.7835235595703
2012	99.7588729858398
2013	99.6587982177734
2014	98.68798828125
2015	100.125358581543
2016	99.3918762207031
2017	98.8952026367188
2018	98.0369415283203
2019	98.0402679443359
2020	98.3282470703125
2021	98.6386108398438