Year including construction (constant 2010 US$) 1991 8428.33539037041 1992 8870.69782622075 1993 8959.11613810783 1994 9050.80710648013 1995 9303.76278447182 1996 9380.84930892652 1997 9671.73561310304 1998 9964.06823757614 1999 10222.5441360728 2000 10063.3607525229 2001 9629.99524569937 2002 9664.11202558716 2003 9440.68469519935 2004 11027.2787005701 2005 10357.9624304909 2006 9973.48286203133 2007 10253.7334618529 2008 10174.7160625961 2009 9685.96040564017 2010 9656.81429369314 2011 10829.9564460693 2012 9961.23529030862 2013 11756.8185702506 2014 10999.0929550821 2015 11437.612973737 2016 10218.044238777 2017 10115.6991877121 2018 10170.4849667372