Year including construction (constant 2010 US$) 1991 2225.17302725689 1992 2604.70818016531 1993 2954.14661861276 1994 3319.42014382395 1995 3603.80985018957 1996 3873.03724360531 1997 4232.1125843552 1998 4616.33977798831 1999 5040.10011260476 2000 5504.88647893297 2001 6041.53377528503 2002 6691.10356233754 2003 7442.99976181159 2004 7935.82597052968 2005 8592.3581054417 2006 9410.99763513168 2007 10588.7236458416 2008 11525.5863322949 2009 12560.6870388284 2010 13934.2605374004 2011 15032.1866286568 2012 16137.1687856783 2013 17036.039079055 2014 17936.1903211321 2015 19141.4255867532 2016 20304.7686068904 2017 21567.2349386377 2018 23150.3101567359