Year including construction (constant 2015 US$) 1995 14581.305344396602 1996 15581.31350846771 1997 17192.59470791508 1998 18015.15591311588 1999 19183.05284385634 2000 20949.553052937834 2001 21888.33456015316 2002 22432.25610370286 2003 23812.954354458812 2004 24926.92825279345 2005 27536.44773330126 2006 27900.225040480465 2007 25503.60924545794 2008 25278.73059835772 2009 24084.048708103448 2010 24157.414142151847 2011 24183.294072098273 2012 23249.832100109285 2013 23841.64438858541 2014 24104.80742670469 2015 24608.9573205007 2016 25687.37720110972 2017 26391.708428521844 2018 25525.026476953724 2019 26218.71213196743 2020 25050.212142381843 2021 28450.865432128772 2022 29267.049014811404