Year including construction (constant 2015 US$) 1991 7589.336894460358 1992 7432.051685863391 1993 7555.28472407355 1994 7658.133359518642 1995 7859.676708126524 1996 8219.428646868986 1997 8532.579725389793 1998 8643.844993673993 1999 8939.08090241647 2000 9342.742823898847 2001 9476.195410011473 2002 9953.477451150193 2003 10442.767314765055 2004 10886.620510346494 2005 11171.49222142567 2006 11673.677250415289 2007 12068.670878511002 2008 12464.097323047712 2009 12531.90957070477 2010 13163.814095410915 2011 13601.404537183918 2012 13803.227539869717 2013 14300.484195337855 2014 14789.134199762353 2015 15336.263349454473 2016 15801.044718990986 2017 16272.261014381318 2018 16659.672630863362 2019 16871.00565609977 2020 17159.963905912155 2021 17638.209858362934 2022 17680.80019878512