Year including construction (constant 2015 US$) 1991 54198.92295694597 1992 55476.429066638935 1993 55043.8872617971 1994 58203.358919184146 1995 54773.534288814546 1996 55450.80113527326 1997 56823.34320254563 1998 57073.63922912668 1999 58119.83840101824 2000 60176.89331829854 2001 60640.917632781966 2002 60902.721219084524 2003 61958.39727391308 2004 63830.99179489995 2005 64921.63470605146 2006 66409.7527865352 2007 67396.69636406041 2008 66672.15434479469 2009 63245.06306069939 2010 68780.8312535602 2011 70797.84248223733 2012 70947.37449531094 2013 71703.60521380484 2014 72947.76265117122 2015 74601.09756752444 2016 75753.85196209718 2017 76814.67385292055 2018 77217.05178871732 2019 77091.58009505297 2020 73813.97873343565 2021 79524.80744486272 2022 79267.16554356623