Year Measure 1990 4755.07347 1991 4011.46922 1992 2662.35179 1993 2616.74224 1994 3233.11104 1995 3253.80884 1996 2789.90629 1997 2750.0178 1998 2838.13284 1999 3320.76459 2000 3294.77046 2001 3321.97968 2002 3431.57682 2003 3788.40812 2004 3915.2028 2005 4032.96043 2006 4082.80256 2007 4594.93337 2008 4587.4564 2009 3970.28904 2010 4459.2478 2011 4769.83205 2012 4847.81217 2013 4883.23543 2014 4893.4875