Year including construction (constant 2015 US$) 1991 11503.125654470665 1992 11260.797654279117 1993 10650.975009731043 1994 10301.725483795584 1995 9798.183946084013 1996 9896.36904425618 1997 9865.342232548119 1998 9686.283100506746 1999 9367.604019092656 2000 9512.23589806524 2001 9414.273122434755 2002 9809.879822459718 2003 10011.089928113925 2004 10073.128524976653 2005 10342.400454183517 2006 10433.171967580183 2007 10634.755015081728 2008 10965.460189599995 2009 10688.840990191859 2010 10965.59545300359 2011 11109.725965926085 2012 10801.688573315481 2013 10598.108024754538 2014 10579.440917677055 2015 10216.503473553712 2016 9884.447177786198 2017 9814.169850705926 2018 9768.567171072802 2019 9748.52023291324 2020 9123.209073545751 2021 9049.66437501559 2022 8660.720585837302