Year including construction (constant 2010 US$) 1991 7116.07458053104 1992 7495.40392959501 1993 7690.61863933062 1994 8928.09840735769 1995 9052.63872006834 1996 9437.87858893738 1997 9343.78140089575 1998 9273.38537052805 1999 9901.9848416342 2000 9961.49410356499 2001 10364.5037547981 2002 10402.1577261327 2003 10529.7656845001 2004 11081.4059168057 2005 10574.0531576576 2006 10418.7473649031 2007 10092.8085910682 2008 10833.3542993877 2009 10630.601247885 2010 11192.0803950557 2011 11272.297129355 2012 11490.2898076655 2013 12022.3611075265 2014 12687.8238456084 2015 13792.5226656173