Year including construction (constant 2010 US$) 1970 28838929.1968595 1971 32245668.8223688 1972 32352167.5231505 1973 39925860.7776662 1974 45528694.2919775 1975 44961391.8741948 1976 52227898.9013699 1977 58307868.0460546 1978 55283283.0054629 1979 58648473.7558332 1980 65429289.180107 1981 59998403.9000173 1982 85396515.8371967 1983 73296834.9953743 1984 82286200.4393953 1985 85430471.5914171 1986 87636876.5240348 1987 93108993.7913921 1988 121481122.777684 1989 146710565.051311 1990 173001362.31023 1991 256342750.609419 1992 285693075.890748 1993 297303810.93499 1994 324671941.640715 1995 362721850.595662 1996 389926296.527812 1997 381345387.362035 1998 387812690.989536 1999 409857312.651596 2000 468675211.726675 2001 495559405.900787 2002 527200988.9363 2003 566987284.982603 2004 567646436.131112 2005 580742631.824539 2006 618202775.886819 2007 661296369.706986 2008 719228847.505378 2009 673848773.625088 2010 720109271.704092 2011 743587628.164328 2012 781584019.632994 2013 711538734.522106 2014 697909021.533187 2015 738623945.298643 2016 760732931.762584 2017 732580162.311274