Year including construction (constant 2010 US$) 1991 12115.758504153 1992 15758.4984116932 1993 14806.5314098583 1994 16016.6546881478 1995 17659.9685337077 1996 18407.3120954254 1997 35136.3406937325 1998 53146.2380330778 1999 60822.9723491785 2000 59619.4268118882 2001 58919.848878654 2002 50244.9865536594 2003 30151.5199165547 2004 41700.7310008353 2005 38947.0617306441 2006 40432.2108242019 2007 42379.2414898365 2008 46436.6196293439 2009 47552.118522159 2010 47900.2951714227 2011 48753.8589851093 2012 53627.6290683052 2013 53661.239017249 2014 53280.9108995294 2015 55674.9500260939 2016 66390.7788039545 2017 61969.3599143171 2018 59341.5985529045