Year including construction (constant 2010 US$) 1991 4682.77138688812 1992 4688.84034458075 1993 4662.69567737037 1994 4459.5230823079 1995 4481.88403366303 1996 4390.76235472134 1997 4397.11853276221 1998 4346.6228830928 1999 4315.67313513386 2000 4449.08959262825 2001 4424.06769032946 2002 4407.71178210819 2003 4372.13349272231 2004 4328.91138239242 2005 4301.60847299511 2006 4286.41262477326 2007 4259.27692120442 2008 4431.17343841967 2009 4205.02583173875 2010 4800.00572223125 2011 4815.4780359562 2012 4686.39601925268 2013 4760.12960218448 2014 4427.21275050235 2015 4246.27512085415 2016 4291.26774643506 2017 4347.91393537716