Year including construction (constant 2010 US$) 1991 10801.8797380432 1992 11054.3029009912 1993 10300.3336676658 1994 9765.74082984342 1995 9426.17099517762 1996 9660.46292474215 1997 11021.6204388058 1998 12481.4358650622 1999 12881.7319928767 2000 13299.0171623174 2001 13478.1308694813 2002 13236.024268257 2003 12039.6600741517 2004 13227.5798283934 2005 13314.1672927182 2006 13528.0310616432 2007 13717.7582969875 2008 13675.4109563476 2009 13455.0484549446 2010 13330.3812338966 2011 13281.3347898085 2012 13374.2310951235 2013 13324.5455932973 2014 13409.9638271354 2015 13421.1536876294 2016 13701.3553690154 2017 13484.0751812353 2018 13093.8470797563