| Year | Value | | 2014 | 3,714.3829884421 | | 2013 | 3,754.2686977361 | | 2012 | 3,819.2802534846 | | 2011 | 3,900.6013612041 | | 2010 | 3,922.3108668824 | | 2009 | 3,818.4225007032 | | 2008 | 3,990.2963195857 | | 2007 | 3,846.6740769664 | | 2006 | 3,744.4687147934 | | 2005 | 3,582.2460729279 | | 2004 | 3,429.3546438694 | | 2003 | 3,257.8898679857 | | 2002 | 3,191.4097384253 | | 2001 | 2,993.2724631493 | | 2000 | 2,828.8150621869 | | 1999 | 2,778.8876338835 | | 1998 | 2,631.4308819133 | | 1997 | 2,609.9688638388 | | 1996 | 2,405.0398751661 | | 1995 | 2,314.7035841759 | | 1994 | 2,203.1270689919 | | 1993 | 2,218.2549886827 | | 1992 | 2,227.7983958278 | | 1991 | 2,608.859587351 | | 1990 | 2,966.2776658612 |
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