Year including construction (constant 2010 US$) 1991 15793.9430568516 1992 14067.624645635 1993 14964.0988106695 1994 14477.4944995254 1995 14290.3841288155 1996 14182.1985894537 1997 14632.8928892613 1998 15041.1309483913 1999 16131.1303571586 2000 15982.5921698308 2001 14070.6818339715 2002 13813.9677009025 2003 14167.0295121227 2004 14282.4037149136 2005 14729.2669697111 2006 15094.1782893673 2007 15235.0856663497 2008 16975.2676561719 2009 17457.9885773802 2010 19145.1644859993 2011 22078.2229158523 2012 26085.2361608584 2013 26641.2154720936 2014 29291.2715362589 2015 34069.6026266671 2016 36167.7014727208 2017 37018.6091989994 2018 37185.5101803734