Year	including construction (constant 2010 US$)
1970	11337764230.78
1971	12338897840.8944
1972	13264389864.3911
1973	13769725580.3466
1974	13792513292.8526
1975	13752000351.5007
1976	16296947964.915
1977	17161532853.9703
1978	18836901481.8886
1979	21593215762.7432
1980	22367392747.753
1981	22594894242.0411
1982	24205861334.8755
1983	27172092214.6735
1984	30426498321.8786
1985	29576847026.1879
1986	30923360442.2461
1987	32136774068.3698
1988	36025076978.7113
1989	36929435721.5625
1990	40020861347.6241
1991	43915689919.5927
1992	46887975505.2622
1993	50433349166.4338
1994	55459085933.3768
1995	64620590015.8331
1996	72498975318.9904
1997	77406366800.1614
1998	70202284654.3107
1999	75983519729.285
2000	84141373133.4016
2001	82035705473.2855
2002	85472630219.4903
2003	91789801496.3832
2004	98195536773.152
2005	101272273198.597
2006	105634589363.882
2007	106468321691.348
2008	105537421191.518
2009	98496333426.4693
2010	103279004066.934
2011	105834963211.325
2012	111055540032.908
2013	115105709229.766
2014	121867374499.395
2015	128245319921.766
2016	133729160845.674
2017	140092204526.404
2018	144984943031.884