Year | Value | 2014 | 690.76596255654 | 2013 | 677.2811186652 | 2012 | 658.56854122911 | 2011 | 638.3364356253 | 2010 | 633.39064020618 | 2009 | 585.51678580613 | 2008 | 582.35227888876 | 2007 | 580.64091622888 | 2006 | 567.65595393998 | 2005 | 576.73636772015 | 2004 | 575.95366160265 | 2003 | 556.16617020226 | 2002 | 522.81110847076 | 2001 | 519.13891635965 | 2000 | 499.56243871798 | 1999 | 467.9139405567 | 1998 | 479.63592506774 | 1997 | 464.25384938431 | 1996 | 431.30612968483 | 1995 | 401.88898073584 | 1994 | 380.44186747896 | 1993 | 338.07320307041 | 1992 | 337.74108247109 | 1991 | 356.48935225014 | 1990 | 363.01819438028 | 1989 | 362.16468105035 | 1988 | 343.64195078682 | 1987 | 318.80073517149 | 1986 | 309.67831345369 | 1985 | 347.00012734284 | 1984 | 337.2328099887 | 1983 | 357.14501150285 | 1982 | 332.36142972503 | 1981 | 330.78143364655 | 1980 | 365.61681102917 | 1979 | 337.76395722021 | 1978 | 321.19770396376 | 1977 | 320.87608713405 | 1976 | 321.54577513142 | 1975 | 306.31380304107 | 1974 | 300.13295537166 | 1973 | 310.89262117326 | 1972 | 250.63127848416 | 1971 | 226.12194667051 |
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