Year including construction (constant 2010 US$) 1999 36275.0406816022 2000 37543.6400761419 2001 35851.8714351124 2002 36489.1195712213 2003 37151.3772717279 2004 34048.3671135653 2005 33345.7864698644 2006 31215.6085146667 2007 31040.6114091952 2008 29339.2639861494 2009 27721.3314162634 2010 26911.1919813044 2011 26235.775732411 2012 26518.6408415378 2013 25313.8128949177 2014 27123.2811494561 2015 27954.1598195966 2016 28764.1790798236 2017 30025.5031988258