Year including construction (constant 2010 US$) 1991 3959.37358319268 1992 4385.5337527505 1993 4481.96888179601 1994 5106.20486057872 1995 5389.14497364474 1996 5939.1874804867 1997 5862.2742324089 1998 6379.86193523279 1999 6274.33130815653 2000 6517.6298512102 2001 5806.72415138799 2002 5861.00598182445 2003 5777.50529546839 2004 5909.42286799093 2005 6197.07259040813 2006 6305.13164466384 2007 6758.91186024705 2008 7453.99250515523 2009 6904.12876233501 2010 6650.30352623108 2011 6582.15608577646 2012 6487.73330593761 2013 6538.56905661739 2014 6742.71557983947 2015 6483.79734203865 2016 6595.01811478474 2017 7004.90174532908 2018 7549.66056616448