Year Measure 1990 2949.28414 1991 2791.67473 1992 2335.40919 1993 2058.64963 1994 1893.96336 1995 1849.58528 1996 1839.98353 1997 1821.35199 1998 1796.18086 1999 1663.91506 2000 1618.46001 2001 1759.16087 2002 1763.25756 2003 1889.95413 2004 1961.10462 2005 2022.56433 2006 2113.71073 2007 2179.81389 2008 2106.36369 2009 2055.82469 2010 2148.65355 2011 2066.63757 2012 2170.58583 2013 2156.16201 2014 2176.84331