Year | Value | 2021 | 834.08984702604 | 2020 | 806.74364738113 | 2019 | 822.75721204192 | 2018 | 810.61407121992 | 2017 | 871.71528800142 | 2016 | 812.25287064942 | 2015 | 790.90326467769 | 2014 | 826.51240001798 | 2013 | 770.0101926239 | 2012 | 703.03098982725 | 2011 | 689.2374010432 | 2010 | 639.70547375291 | 2009 | 618.35274761352 | 2008 | 605.87022613459 | 2007 | 514.27345727746 | 2006 | 451.04225947039 | 2005 | 397.7177251728 | 2004 | 362.08261934232 | 2003 | 322.91925168258 | 2002 | 300.63694445734 | 2001 | 291.30465305829 | 2000 | 315.63880293923 | 1999 | 302.46481314486 | 1998 | 299.12171854897 | 1997 | 284.18966859592 | 1996 | 281.41547647605 | 1995 | 263.15081705834 | 1994 | 234.90046588614 | 1993 | 297.23846422062 | 1992 | 303.87579521486 | 1991 | 324.70115219115 | 1990 | 323.53150304434 | 1989 | 310.71217766222 | 1988 | 340.53384628065 | 1987 | 343.64868662911 | 1986 | 322.2227479951 | 1985 | 286.79664598326 | 1984 | 281.65079553264 | 1983 | 282.54626478261 | 1982 | 290.96609401032 | 1981 | 301.82209188851 |
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