Year including construction (constant 2015 US$) 2002 16218402627.220385 2003 16204350612.63218 2004 18602749163.756718 2005 22415555891.896744 2006 25372918799.415665 2007 30396477839.29241 2008 33304439198.293083 2009 32005566073.110905 2010 31976103891.586056 2011 31286847747.068718 2012 34576343017.59802 2013 35602642243.69369 2014 35044569491.00036 2015 37947947442.25442 2016 37708748567.10282 2017 36506842679.983635 2018 34238691398.085464 2019 33047869594.768505 2020 29590548255.37488 2021 27123283361.393402 2022 27602585225.198902 2023 25619577432.487446