Year including construction (constant 2015 US$) 1995 48447.91124449225 1996 45962.78348386892 1997 47083.248628767 1998 47648.148452131056 1999 49101.84190719204 2000 51528.29391537274 2001 52177.629879010325 2002 52965.24633018258 2003 54013.93461180242 2004 55572.72707354714 2005 56544.245597359186 2006 57887.603528567975 2007 58575.4312919577 2008 57731.50457836915 2009 54954.08772880052 2010 59915.42252950218 2011 61745.34192322349 2012 61586.993158791745 2013 61779.23259002445 2014 62663.0879570749 2015 64307.61506207657 2016 64822.53376010892 2017 65611.65688220672 2018 66122.8469015091 2019 66149.59644716192 2020 63491.55603694141 2021 68129.89177111276 2022 68566.68335268868