Year including construction (constant 2015 US$) 1991 5631.779593710547 1992 5061.425496368334 1993 4648.957214918791 1994 4494.432191720333 1995 5505.751763622801 1996 5890.747041494245 1997 5935.92808923181 1998 5983.293339170635 1999 6069.630504990258 2000 6292.680684353393 2001 6040.641931883519 2002 6432.98751662405 2003 7165.855779222872 2004 7349.666187164489 2005 8183.093164220671 2006 8814.301496555268 2007 7980.169083781862 2008 8186.93505910523 2009 8859.93669763689 2010 10112.375129552038 2011 11285.144340539962 2012 10751.429472857435 2013 10921.547460964539 2014 11697.716898379207 2015 12203.896894482588 2016 11633.680380371266 2017 11460.089896680925 2018 10739.538709186756 2019 10834.21335886021 2020 10319.633126734328 2021 10299.457388154653 2022 10811.400059426558