Year including construction (constant 2015 US$) 2000 27877.797442394745 2001 28739.206548224996 2002 29685.390557636125 2003 31006.144883715715 2004 31337.020589749176 2005 31170.918626146537 2006 30784.374134154627 2007 31165.722882741808 2008 32359.913221094237 2009 35371.28106992701 2010 34133.26615517556 2011 35597.95427921808 2012 37640.19654921327 2013 38355.23654791954 2014 38589.7224017117 2015 41903.29876430557 2016 41460.64443952425 2017 42509.123797085456 2018 42039.546597256245 2019 44128.93657731432 2020 44192.5353224636 2021 38960.175649619036 2022 40631.59965399039