Year | Value | 2021 | 1,305.2666591416 | 2020 | 1,227.99433822 | 2019 | 1,312.7612495698 | 2018 | 1,318.3224409878 | 2017 | 1,312.1216043274 | 2016 | 1,259.5367368639 | 2015 | 1,378.5229004846 | 2014 | 1,543.0931452568 | 2013 | 1,469.0864872034 | 2012 | 1,399.1466563291 | 2011 | 1,353.1478019488 | 2010 | 1,252.2201845892 | 2009 | 1,115.7266911047 | 2008 | 1,115.0720535145 | 2007 | 1,046.9606488101 | 2006 | 957.52990380896 | 2005 | 819.68496247143 | 2004 | 722.56674277484 | 2003 | 598.99440022143 | 2002 | 485.90062496828 | 2001 | 455.16720318196 | 2000 | 486.31044804784 | 1999 | 492.8482577935 | 1998 | 494.55561971399 | 1997 | 518.14152169776 | 1996 | 509.40143188148 | 1995 | 502.75008509239 | 1994 | 441.40848727067 | 1993 | 465.90355777246 | 1992 | 513.8656637643 | 1991 | 531.3058386487 | 1990 | 519.2415667287 | 1989 | 472.85250324442 | 1988 | 501.53653226624 | 1987 | 489.22475803632 | 1986 | 449.02981712195 | 1985 | 451.1522965385 | 1984 | 511.56980122572 | 1983 | 605.85694036592 | 1982 | 722.63378204201 | 1981 | 812.33978738596 | 1980 | 525.66176803235 | 1979 | 402.63387265452 | 1978 | 368.84773761784 | 1977 | 335.49933717015 | 1976 | 326.66817112194 | 1975 | 311.76500805802 | 1974 | 290.17495484425 | 1973 | 238.33076299411 | 1972 | 191.15883789469 | 1971 | 175.3958580078 |
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