Year | Value | 2021 | 391.03961542643 | 2020 | 369.28344448684 | 2019 | 373.05881438553 | 2018 | 382.50670000606 | 2017 | 361.35378520119 | 2016 | 311.42639081167 | 2015 | 293.40262690336 | 2014 | 325.41736432264 | 2013 | 295.71046808909 | 2012 | 468.96838453653 | 2011 | 460.75459216562 | 2010 | 419.94199259779 | 2009 | 416.02296708975 | 2008 | 408.3921169035 | 2007 | 359.45569039019 | 2006 | 314.19247321124 | 2005 | 292.45421571951 | 2004 | 282.25694790098 | 2003 | 259.85151834909 | 2002 | 230.8936559774 | 2001 | 220.88400358674 | 2000 | 219.95976981984 | 1999 | 247.45669373162 | 1998 | 242.95394693975 | 1997 | 240.6544492321 | 1996 | 261.8784662797 | 1995 | 303.90149724344 | 1994 | 236.26180651342 | 1993 | 361.33177641124 | 1992 | 414.17180118033 | 1991 | 417.83245592334 | 1990 | 449.72491330748 | 1989 | 394.92192136666 | 1988 | 410.49889300342 | 1987 | 394.00397100903 | 1986 | 381.57144362422 | 1985 | 299.9204781712 | 1984 | 219.15317018428 | 1983 | 225.87504366771 | 1982 | 262.59674633408 | 1981 | 249.12641595367 | 1980 | 278.78562399145 |
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