Year including construction (constant 2015 US$) 1991 3291.258827609617 1992 3280.282362653127 1993 3098.773900670556 1994 3058.698481853669 1995 3033.2458540706525 1996 3087.5359852837173 1997 3111.9109043663757 1998 3004.876774832419 1999 2730.1550341489587 2000 2726.386004831821 2001 2742.2321701396827 2002 2773.920844326407 2003 2829.3950610304255 2004 2834.4681273372707 2005 2733.05993089396 2006 2756.280656852793 2007 2637.574086186828 2008 2603.1614357671624 2009 2949.624686645679 2010 3124.7785510822887 2011 3075.900786086194 2012 4020.3951246238043 2013 4226.585049065356 2014 4259.233950062998 2015 4106.229639694281 2016 3876.724315139422 2017 3988.970412216961 2018 4057.767755809492 2019 4253.540150689979 2020 4125.218082879842 2021 4114.307803424095 2022 3853.730613000741