Year including construction (constant 2010 US$) 1991 3781.64916750362 1992 3912.41981141265 1993 3875.26476431387 1994 3465.70479259299 1995 3660.24338675481 1996 3752.83300958425 1997 4367.23777688973 1998 4488.59432351946 1999 4464.06917022111 2000 5154.00034366529 2001 5627.43038174635 2002 6467.20855442431 2003 6137.38769034924 2004 6312.50909441831 2005 6444.99312200904 2006 6057.73143445808 2007 6196.0048661865 2008 6057.27177454545 2009 5790.24400826085 2010 5662.29715504841 2011 5920.02518770357 2012 5325.41620950755 2013 5488.11915724033 2014 5823.16501343161 2015 5536.35458854412 2016 7202.41090347827 2017 7297.8524107021 2018 7220.84694954838