Year Measure 1991 473.88213 1992 488.35221 1993 510.13248 1994 533.75203 1995 567.33434 1996 591.21448 1997 586.32093 1998 594.35392 1999 577.18502 2000 536.90101 2001 625.27074 2002 570.42464 2003 587.18925 2004 608.71041 2005 652.3111 2006 645.9863 2007 657.05762 2008 690.98665 2009 693.34828 2010 707.94139 2011 716.89472 2012 727.03533 2013 749.74401 2014 761.61497