Year including construction (constant 2015 US$) 1991 22781.333937708496 1992 22136.835630603447 1993 22273.980302120013 1994 22669.97076869837 1995 21409.849497473544 1996 21808.834380838816 1997 23840.0906473769 1998 23349.995113891935 1999 22886.80336870656 2000 23404.942803757844 2001 22562.664515208602 2002 22552.562587522523 2003 23489.40183468497 2004 23717.55221807529 2005 24422.20959826857 2006 25182.236023607707 2007 24002.678735792877 2008 25620.551062981092 2009 24128.018419553187 2010 24907.31839408106 2011 26175.070756816735 2012 25824.006894600087 2013 25894.675245585317 2014 25418.96659670158 2015 24500.71755250615 2016 25933.95387689578 2017 25951.827256152596 2018 24544.647348812203 2019 25706.691204144496 2020 35105.41537843759 2021 37684.95986044759 2022 57081.493682438