Year including construction (constant 2015 US$) 1991 5164.411761813924 1992 5859.363077505249 1993 6144.743654877437 1994 5708.2229833923975 1995 5813.047372141166 1996 6197.676351546123 1997 6422.225202915199 1998 6391.249703144492 1999 6599.798786870009 2000 6957.302821399349 2001 6739.683231723508 2002 6635.392257317543 2003 6814.691874145913 2004 6901.313370670252 2005 6549.332576439504 2006 7008.278062331916 2007 7414.281930773399 2008 7731.160718198729 2009 8500.785484294594 2010 9424.765820334918 2011 10412.181245116662 2012 10633.524332701692 2013 11123.598520681111 2014 12009.743373106721 2015 11896.965868314144 2016 12342.722674132023 2017 12774.872881235964 2018 13300.384713549676 2019 12695.624722870092 2020 12728.359381704639 2021 12979.191143212103 2022 10938.756773405383