Year including construction (constant 2015 US$) 1991 9747.890278703688 1992 9568.833717955855 1993 9886.818017464138 1994 9746.247450730196 1995 10070.446653896748 1996 10512.08725344625 1997 10620.606652592158 1998 10965.825973994723 1999 11297.014074051924 2000 11638.464964073539 2001 12124.678504056645 2002 12418.666590307224 2003 12192.046866900879 2004 12403.015709658208 2005 12697.27074954214 2006 12641.03923400116 2007 12511.862972114892 2008 13032.112642077585 2009 12337.17732329463 2010 12219.908731286594 2011 11950.73341241315 2012 11978.533711987693 2013 11145.873574048073 2014 11560.68744768915 2015 10899.60415478338 2016 12301.509531297479 2017 14429.012950759437 2018 15431.518281362727 2019 15000.310060296115 2020 15885.773181866092 2021 15467.852686163777 2022 15412.358108984668