Year including construction (constant 2015 US$) 1993 15159.407853668963 1994 15573.498502065215 1995 17562.427088904897 1996 18557.11799656361 1997 18129.200221390984 1998 18046.12975688099 1999 18703.97994488239 2000 19813.205190732893 2001 20406.199868363532 2002 21100.133801210086 2003 21426.48858261493 2004 23150.107405219856 2005 25183.878594568247 2006 28387.919891526788 2007 29215.258138941863 2008 30664.845225568828 2009 29477.612981412793 2010 32243.328165566072 2011 33419.45335328689 2012 32241.68154156264 2013 31667.114208276176 2014 31981.949502200372 2015 33135.84210736529 2016 33089.1351449312 2017 34703.84245560218 2018 35241.34452136614 2019 36102.616707578905 2020 32984.6015854352 2021 35176.513982170436 2022 35034.44443149859