Year including construction (constant 2010 US$) 1995 29296.0696291037 1996 32076.1649477191 1997 33484.392636701 1998 29161.126962293 1999 30136.3221459651 2000 30594.5063399526 2001 31531.9942124278 2002 30759.9920268953 2003 31083.5717565845 2004 33107.4154852677 2005 33131.4991234318 2006 33225.3246767507 2007 33999.8588010684 2008 34413.6926795949 2009 33702.7655803844 2010 35538.8659035044 2011 36638.5366712458 2012 38327.8687416427 2013 40792.3839125946 2014 39878.0713209042 2015 39572.4663417759 2016 39415.4299494086 2017 38980.9248091968 2018 39229.7608102835