| Year | Value | | 2014 | 4,271.7446669105 | | 2013 | 4,444.222970766 | | 2012 | 4,386.5345515821 | | 2011 | 4,489.5708504957 | | 2010 | 4,358.812173624 | | 2009 | 4,224.3976654486 | | 2008 | 4,291.8431579345 | | 2007 | 4,159.1372252468 | | 2006 | 4,040.4400201901 | | 2005 | 3,921.906458862 | | 2004 | 4,258.2515683376 | | 2003 | 4,332.6790623896 | | 2002 | 4,480.3443516874 | | 2001 | 4,434.3702409284 | | 2000 | 4,198.7157057432 | | 1999 | 3,979.3639622084 | | 1998 | 4,302.9991100387 | | 1997 | 4,291.3178053949 | | 1996 | 4,132.5612112903 | | 1995 | 3,789.9864885015 | | 1994 | 3,411.1482126057 | | 1993 | 3,479.5339372751 | | 1992 | 4,274.5471608689 | | 1991 | 4,411.4804869533 | | 1990 | 4,628.6580543106 |
|