Year including construction (constant 2010 US$) 1995 16752.9848492186 1996 17071.089477474 1997 17476.2897797274 1998 17848.3915823694 1999 18882.8603976114 2000 19474.9054967955 2001 19680.3082194698 2002 21450.8867063089 2003 22486.9884976628 2004 23822.0016399163 2005 23932.5818839308 2006 24696.7835868486 2007 24984.6296381043 2008 24347.6523985136 2009 25537.1062864867 2010 28317.3293147733 2011 30458.6652727662 2012 30948.6760716289 2013 30637.1432685874 2014 31655.1627490548 2015 32650.3363104247 2016 31369.0267887261