Year including construction (constant 2015 US$) 2000 13353.156262630077 2001 13027.280998280563 2002 12662.247706157472 2003 12780.897251333372 2004 15043.27706329931 2005 16603.69812419835 2006 17413.587846226863 2007 16863.715025040427 2008 18069.522083681215 2009 15496.93298601436 2010 15970.961185129769 2011 15522.60709323999 2012 15032.373987058245 2013 15852.398691152648 2014 14907.754063859407 2015 14840.60075093903 2016 15570.720254396156 2017 16822.965307018745 2018 16852.036415265153 2019 16594.920523876237 2020 17539.391255295595 2021 17047.551588768463 2022 15522.743719129607