Year including construction (constant 2015 US$) 1991 9282.461697804332 1992 8751.85228364991 1993 8453.23759101774 1994 8416.005303769603 1995 8023.359078372491 1996 8032.754502537952 1997 8008.451075834306 1998 7821.877148232229 1999 7770.817644858262 2000 7965.3775009039455 2001 7770.206511209651 2002 8630.730078303819 2003 8597.200434218756 2004 8738.838136724942 2005 9150.088126034034 2006 9549.634757217022 2007 10085.996903661244 2008 10869.90950886794 2009 10424.230479844662 2010 10855.863545651637 2011 10649.456277535664 2012 10248.077548181927 2013 10124.72233526146 2014 10193.223061732984 2015 10048.099116859015 2016 10069.510856438132 2017 10023.175737276146 2018 10031.441003502376 2019 10023.65797797839 2020 9428.574886198596 2021 9594.28907781895 2022 9309.202872309215