Year	% gross
1970	100.913917541504
1971	110.106437683105
1972	113.602523803711
1973	115.337127685547
1974	115.750297546387
1975	115.312538146973
1976	114.593101501465
1977	113.103858947754
1978	112.242027282715
1979	109.627380371094
1980	107.494850158691
1981	105.712608337402
1982	105.301010131836
1983	104.240089416504
1984	104.735801696777
1985	104.535018920898
1986	104.917388916016
1987	104.813140869141
1988	103.402496337891
1989	103.532699584961
1990	102.117866516113
1991	100.206649780273
1992	99.5548782348633
1993	99.3280029296875
1994	98.3822021484375
1995	98.2952728271484
1996	99.9359283447266
1999	103.690902709961
2000	105.045707702637
2001	106.493721008301
2002	108.923667907715
2003	108.239158630371
2004	109.761222839355
2005	108.754692077637
2006	109.352157592773
2007	110.56192779541
2008	109.24104309082
2009	107.18009185791
2010	106.050537109375
2011	104.953880310059
2012	103.401817321777
2013	102.204330444336
2014	99.1061172485352
2015	96.0123977661133
2016	93.1031112670898
2017	94.5970306396484
2018	98.6910018920898
2019	93.0783233642578
2020	94.2594528198242
2021	100.735511779785
2022	101.456001281738