Year including construction (constant 2015 US$) 1995 24224.049896022527 1996 25271.672737593934 1997 25536.4227246691 1998 25506.15055453817 1999 26149.770538978966 2000 25495.017423488032 2001 25997.094392712923 2002 26922.42468397245 2003 27550.979371499987 2004 27379.651631882432 2005 27998.131523403074 2006 33270.655954671805 2007 32854.61872079603 2008 32082.082079867476 2009 30751.08173871401 2010 31476.211495675252 2011 31690.607702846137 2012 31565.015923154653 2013 31901.387999536953 2014 31763.72917402646 2015 31668.549565946236 2016 31775.739823591484 2017 31986.213538255353 2018 31913.033131227723 2019 32415.5535911548 2020 33945.77403117488 2021 34962.68898700116 2022 36764.54796133901