Year Measure 1990 4344.17273 1991 4601.70015 1992 2978.41121 1993 2472.21742 1994 2220.42036 1995 2401.12017 1996 2610.04195 1997 2490.34764 1998 2633.26187 1999 2259.65641 2000 2037.61956 2001 2384.74273 2002 2574.35333 2003 2709.24976 2004 2779.1959 2005 2662.80073 2006 2666.01334 2007 2927.24122 2008 2975.912 2009 2770.83236 2010 2275.76017 2011 2412.4807 2012 2468.99882 2013 2356.645 2014 2387.27519