Year	% gross
1971	107.970947265625
1972	107.550796508789
1973	101.858978271484
1974	104.727439880371
1975	105.020050048828
1976	105.691902160645
1977	105.923469543457
1978	105.254028320312
1979	104.187370300293
1980	104.177642822266
1981	103.976486206055
1982	104.143630981445
1983	101.707931518555
1984	101.443298339844
1985	100.716232299805
1986	100.287422180176
1987	99.9147262573242
1988	99.4369888305664
1989	99.0412673950195
1990	98.757080078125
1991	98.8744583129883
1992	98.6924209594727
1993	103.165046691895
1994	103.3916015625
1995	103.540107727051
1996	103.372566223145
1999	101.967742919922
2000	102.907371520996
2001	103.426696777344
2002	103.605331420898
2003	103.77693939209
2004	103.039421081543
2005	103.112442016602
2006	102.793403625488
2007	102.451301574707
2008	102.265731811523
2009	102.259460449219
2010	102.236808776855
2011	101.269889831543
2012	101.520362854004
2013	103.191062927246
2014	103.104873657227
2015	102.243827819824
2016	102.055862426758
2017	102.752861022949
2018	102.500366210938
2019	102.148559570312
2020	102.064270019531
2021	101.821136474609