Year including construction (constant 2015 US$) 1991 12574.490643182105 1992 12911.890706875201 1993 12754.262028235256 1994 14542.951197142402 1995 14727.542693690071 1996 14385.248086986428 1997 13697.827124848582 1998 13529.279784969365 1999 11731.465118959632 2000 13001.933400456815 2001 15317.668584859588 2002 14022.245025802822 2003 16346.755494513023 2004 18377.62195660453 2005 18946.23536607985 2006 17976.693517075688 2007 17552.89186310723 2008 18218.942163712043 2009 18515.97400194855 2010 19039.66803583685 2011 21319.363261996805 2012 22375.280087714204 2013 21908.95264774039 2014 20769.87269581164 2015 19091.157779202098 2016 19189.62826121382 2017 19109.960837452138 2018 18185.520946028282 2019 18970.524782497156 2020 20190.2497253312 2021 18915.441532183595 2022 18747.289972572074