Year including construction (constant 2015 US$) 1991 7844.751578781313 1992 5810.365852865864 1993 5716.902706818183 1994 4576.371702774511 1995 4180.052908558588 1996 3519.3945756135918 1997 3521.608580107127 1998 3896.4985851653605 1999 4036.369957858301 2000 4205.926955163507 2001 4473.403080373706 2002 4464.052528646874 2003 4554.255451322954 2004 4860.533353220178 2005 5399.148947285303 2006 5733.634619817311 2007 6355.794111064526 2008 6206.770458194093 2009 5778.8826990452435 2010 6071.623756075579 2011 6149.085290548232 2012 6328.6412174260295 2013 6239.450897956736 2014 6280.38275641795 2015 6629.932845623054 2016 7277.297582945455 2017 8424.402348658165 2018 9466.655351248635 2019 10048.432828718738 2020 11397.291079492474 2021 12480.849971783697 2022 12948.138767497727