Year including construction (constant 2010 US$) 1991 37172.0755960959 1992 37316.1882120467 1993 36712.3990035321 1994 35492.7209516577 1995 35996.2606951871 1996 36259.4481067734 1997 36647.9133053673 1998 38273.4596634448 1999 36605.0814945235 2000 38560.079580019 2001 36962.5472933605 2002 35938.8833133688 2003 36601.1534105704 2004 37195.9516457214 2005 36899.4822073284 2006 36042.8232487485 2007 35816.4332443038 2008 36564.5542132632 2009 34631.5590849633 2010 41076.0712951389 2011 43283.4182469277 2012 42187.0356913845 2013 41040.6252075515 2014 41514.0518362592 2015 42235.8808948888 2016 43976.5199988766 2017 42538.833793904