Year including construction (constant 2015 US$) 1995 57009.03712164649 1996 58032.480799193116 1997 57302.062474557075 1998 56477.3238500526 1999 55935.777725198765 2000 55786.038574238766 2001 55373.20251505681 2002 54975.91589653149 2003 54681.96666467072 2004 54168.70603865713 2005 53498.21439819365 2006 53081.336593530614 2007 52664.60925947587 2008 54814.73428300251 2009 60002.42515233505 2010 63505.90172307671 2011 64867.37448652077 2012 66655.3913284875 2013 67588.70572076322 2014 68274.36247135563 2015 67189.58794385756 2016 69001.8065751817 2017 67975.02850081315 2018 65777.26359336625 2019 65451.59153245307 2020 58968.719535723074 2021 60235.62029413545 2022 60126.623609084665