Year including construction (constant 2015 US$) 1995 19468.70675960854 1996 21020.571979180186 1997 22735.78939689193 1998 23273.471148753368 1999 26185.58394362384 2000 27773.147173938854 2001 27297.09950889171 2002 28482.26601713916 2003 31144.105794435898 2004 31904.216346037654 2005 32473.72080398477 2006 36407.969177417464 2007 39351.74380518347 2008 40425.60164808625 2009 37071.762888908255 2010 38245.51891072161 2011 40638.003284560684 2012 40714.18418214054 2013 40613.50614923441 2014 42265.2417139892 2015 41180.643071388244 2016 41304.8400400459 2017 42072.62960142893 2018 42542.0774248377 2019 44635.05871047512 2020 43514.462594773926 2021 52927.888758882626 2022 51192.51228736479