Year including construction (constant 2010 US$) 1995 11012.3842764501 1996 11613.6477779676 1997 13305.3786882673 1998 14539.5665248935 1999 14725.4750717367 2000 16189.1579114322 2001 18443.1214355258 2002 22156.6681070249 2003 22949.5937494193 2004 21263.1508993523 2005 23341.7209209611 2006 24627.8351398321 2007 24917.9000489088 2008 24082.9848093264 2009 22891.6706688224 2010 27613.9675617249 2011 27900.8273678224 2012 29222.6474745405 2013 30283.4202286071 2014 31118.1407560527 2015 30338.8458222001 2016 32668.9542743966 2017 34512.9462751113 2018 37141.5517620463