Year Measure 1990 5905.00367 1991 5641.83459 1992 5354.49184 1993 4541.8308 1994 4340.7354 1995 4041.12996 1996 3636.62765 1997 3173.79305 1998 2948.78345 1999 2838.34344 2000 3169.52334 2001 3512.0355 2002 3558.32728 2003 3768.79282 2004 3859.19256 2005 4012.07392 2006 4261.21257 2007 4487.28613 2008 4689.16677 2009 4447.3244 2010 4728.01159 2011 4892.73519 2012 5180.65382 2013 5345.46874 2014 5600.20846