Year	% gross
1970	106.804382324219
1971	106.80689239502
1972	106.96662902832
1973	106.197441101074
1974	105.430816650391
1975	105.409523010254
1976	106.295837402344
1977	105.094718933105
1978	104.910118103027
1979	104.327659606934
1980	104.262603759766
1981	103.938369750977
1982	103.989639282227
1983	103.927642822266
1984	103.882888793945
1985	104.029357910156
1986	104.12818145752
1987	104.335708618164
1988	103.722831726074
1989	103.528137207031
1990	103.173980712891
1991	102.924758911133
1992	103.275688171387
1993	104.277557373047
1994	104.863502502441
1995	104.304901123047
1996	104.328552246094
1997	103.547996520996
1998	104.439331054688
1999	104.241668701172
2000	103.129020690918
2001	103.396583557129
2002	103.094360351562
2003	103.031890869141
2004	103.063812255859
2005	103.873077392578
2006	103.736862182617
2007	103.531219482422
2008	103.20336151123
2009	102.736869812012
2010	102.322006225586
2011	102.181793212891
2012	101.987319946289
2013	102.581428527832
2014	101.890426635742
2015	101.86109161377
2016	101.605850219727
2017	101.917617797852
2018	102.029190063477
2019	102.289710998535
2020	102.383590698242
2021	101.91716003418
2022	101.938217163086