Year including construction (constant 2010 US$) 1991 6446.26800209473 1992 6612.02483137054 1993 6497.05650980113 1994 6560.71220817016 1995 7329.56563837245 1996 7313.36136509742 1997 7566.86799499222 1998 7582.62315164089 1999 7805.77691884925 2000 8444.0574470419 2001 9305.19049363222 2002 10576.2902161411 2003 11142.1652647009 2004 11377.357790258 2005 11434.8349554262 2006 11844.1787059598 2007 12295.5621146559 2008 12793.3920192085 2009 11768.0525175848 2010 11945.8853046487 2011 12224.2019949308 2012 11950.3014518176 2013 11014.2009905519 2014 10673.415156236 2015 11068.3992045815 2016 11121.1880576351 2017 10308.2832232451