Year including construction (constant 2010 US$) 1991 41379.3525917704 1992 41949.2046446558 1993 44350.2183995454 1994 46458.1245414545 1995 39559.4769785879 1996 38904.829295705 1997 45411.7969711444 1998 36163.0811673636 1999 26685.7070023197 2000 28346.1192879467 2001 18030.2728319949 2002 23234.3751870523 2003 37064.1451271775 2004 31223.6365611019 2005 33731.7021386255 2006 27922.3005511619 2007 13524.1282528448 2008 29251.0328336706 2009 29358.794181972 2010 43068.9291125271 2011 47492.4811110808 2012 51349.5553445928 2013 49335.7331911115 2014 49806.3780443401 2015 38314.999897415 2016 39723.3019314546 2017 41206.8103060545