Year	including construction (constant 2010 US$)
1991	39383.2102806696
1992	30326.9718500056
1993	25428.7621004791
1994	20309.8127319428
1995	18393.4639484584
1996	18513.874045786
1997	19550.874262477
1998	19658.807766902
1999	20469.0466708341
2000	23294.9119133678
2001	25970.8336176354
2002	28680.2608203736
2003	29700.8310908396
2004	31881.2482401013
2005	33408.1241220146
2006	36244.9169374352
2007	37229.7872299537
2008	37222.8273434451
2009	37487.9122194735
2010	39105.0682311856
2011	39355.4516513287
2012	38817.645352079
2013	38765.502608767
2014	38634.7928884349
2015	37348.4284459628
2016	36958.8718020483
2017	38556.0521025032
2018	39943.358727869