Year	including construction (constant 2010 US$)
1968	9764813339.25505
1969	11115603763.8571
1970	13225336942.6034
1971	14164247640.7962
1972	14204476735.4961
1973	15499911952.1886
1974	16512135725.1832
1975	15783896264.7672
1976	14382964474.9398
1977	14094281697.509
1978	12987182109.087
1979	12097446942.4535
1980	12684210217.5399
1981	12746645510.8118
1982	12316292432.1243
1983	12803351584.5162
1984	14403239400.9654
1985	14448231341.8999
1986	15146412476.3997
1987	15287438097.3927
1988	14992898955.3653
1989	14335191889.8837
1990	11624547817.4865
1991	9313799187.6497
1992	6526739524.2142
1993	5580555307.38236
1994	5464696186.61727
1995	4898272974.97869
1996	5186131845.77566
1997	4157239099.82246
1998	4072567035.49747
1999	4313527271.70166
2000	4771275920.94391
2001	4386296620.02309
2002	4608996232.05946
2003	4720662372.75383
2004	4992077524.92315
2005	5702372243.48897
2006	5850499118.96077
2007	6112127388.71101
2008	6384341409.22598
2009	6484562164.28106
2010	8343593768.68225
2011	9650031245.3758
2012	10514386027.1484
2013	11613243135.3596
2014	13311797762.3114
2015	14098715891.6691
2016	14168575893.7596
2017	15264722627.6292
2018	17108154616.7218