Year including construction (constant 2010 US$) 1991 8687.68324077328 1992 7448.12590707645 1993 6662.11339257348 1994 6193.36723453676 1995 6868.64465227254 1996 6927.31071086956 1997 7151.62045736692 1998 7215.09219846235 1999 7310.1056934118 2000 7504.51020431783 2001 7025.10025365428 2002 7273.23686050213 2003 8318.80062748509 2004 8678.70564536554 2005 9357.83401028548 2006 9864.88566717794 2007 8914.829309845 2008 9205.38455967943 2009 9456.10295293746 2010 10196.213725138 2011 12225.6410008529 2012 11628.2106936161 2013 11788.0581349049 2014 12579.3088999124 2015 13003.9796038959 2016 12421.4106085801 2017 11929.5437537479 2018 12099.7508131257