Year including construction (constant 2015 US$) 1991 9177.412424046954 1992 10860.531918968589 1993 11681.560437231708 1994 12190.943049655643 1995 14256.971146723827 1996 14191.278644433447 1997 13945.295628772177 1998 13788.336559750414 1999 15318.752137494728 2000 14962.034896552894 2001 15233.553447463477 2002 16507.29676200177 2003 17273.85357234464 2004 15395.757469459879 2005 15135.714985656492 2006 16018.24294262693 2007 24767.33509860968 2008 27169.149862572336 2009 27138.581257194804 2010 30601.88663341218 2011 23121.80764354926 2012 27219.12505332642 2013 20444.282184128286 2014 22036.52320780006 2015 26075.522776272857 2016 25199.074484429737 2017 23317.694338894074 2018 19787.23495657837 2019 15198.965860377311 2020 13329.075855406438 2021 12714.50600810324 2022 13553.032892066838