Year Measure 1990 1572.24569 1991 1444.92078 1992 1049.47567 1993 906.66876 1994 363.41577 1995 388.73568 1996 461.65542 1997 718.04039 1998 892.89545 1999 881.5512 2000 1153.85432 2001 1113.71247 2002 1166.96775 2003 1163.99087 2004 1271.83099 2005 1332.78779 2006 1402.32567 2007 1405.42819 2008 1583.99925 2009 1659.51388 2010 1741.31669 2011 1937.05977 2012 1832.1438 2013 1790.29287 2014 2194.05598