| Year | Value | | 2018 | 601.54119833966 | | 2017 | 770.6079053196 | | 2016 | 927.10298321796 | | 2015 | 1,250.5172220789 | | 2014 | 1,215.0041707473 | | 2013 | 1,172.3089310372 | | 2012 | 1,019.7849092064 | | 2011 | 889.49320892557 | | 2010 | 857.11081307402 | | 2009 | 741.21679967833 | | 2008 | 697.80424077212 | | 2007 | 590.08951515185 | | 2006 | 509.32013963702 | | 2005 | 432.57363554821 | | 2004 | 389.63977095634 | | 2003 | 358.74842710487 | | 2002 | 344.43351881172 | | 2001 | 323.10744514042 | | 2000 | 294.48735015353 | | 1999 | 270.85060204684 | | 1998 | 260.12180537987 | | 1997 | 260.72390388769 | | 1996 | 217.02457896794 | | 1995 | 170.37806898196 | | 1994 | 184.26494200604 | | 1993 | 286.61240915931 | | 1992 | 370.55670494939 | | 1991 | 329.44429160433 | | 1990 | 331.72348666112 |
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