Year including construction (constant 2015 US$) 1994 20182.368095943253 1995 20365.35940949001 1996 20957.052255154937 1997 20321.94016951165 1998 18191.29714742588 1999 18187.823671219645 2000 19021.849692777578 2001 21054.483726488383 2002 22529.78258207548 2003 23582.918325260336 2004 25080.04716910404 2005 25183.337441796022 2006 24933.686389094204 2007 24861.082517843228 2008 26221.61736146539 2009 19504.769364250224 2010 13292.867154559328 2011 13933.230608788697 2012 14032.464945328175 2013 13116.042274445044 2014 12880.824963244417 2015 12608.120818040486 2016 13940.561553578676 2017 12971.762831303144 2018 11193.77646058081 2019 11912.90984314717 2020 10743.064185224814 2021 9358.979019443585 2022 8973.30068337464