Year | Value | 2021 | 668.36760771848 | 2020 | 629.51345214327 | 2019 | 652.57360570997 | 2018 | 617.92227920082 | 2017 | 600.34910418636 | 2016 | 587.26800366226 | 2015 | 596.9906779161 | 2014 | 581.37345656396 | 2013 | 567.95656802481 | 2012 | 573.35986302788 | 2011 | 532.07029342624 | 2010 | 486.99802709709 | 2009 | 461.83443652241 | 2008 | 429.99729915592 | 2007 | 359.65739346981 | 2006 | 303.93101025881 | 2005 | 273.66235989388 | 2004 | 223.46608353104 | 2003 | 201.40385125232 | 2002 | 197.0309837008 | 2001 | 201.84243079534 | 2000 | 217.01883232503 | 1999 | 225.56322869922 | 1998 | 199.10544065477 | 1997 | 190.64035188398 | 1996 | 158.69860762381 | 1995 | 176.22477800975 | 1994 | 79.51370989089 | 1993 | 214.36954017561 | 1992 | 227.03719011225 | 1991 | 217.90286471794 | 1990 | 304.55086536097 | 1989 | 295.18775237145 | 1988 | 305.53125764723 | 1987 | 285.07222161912 | 1986 | 265.75801652904 | 1985 | 248.89585464487 | 1984 | 238.79574744072 | 1983 | 230.87664663895 | 1982 | 221.31600753267 | 1981 | 237.10459642981 | 1980 | 208.27950088311 |
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