Year	including construction (constant 2010 US$)
1991	20778.7611011786
1992	21430.2415368182
1993	19645.5553304248
1994	18247.2950021867
1995	17004.9823587441
1996	17497.7849499816
1997	17450.6436953218
1998	17336.4751528301
1999	16165.2097411019
2000	16666.9677569611
2001	17415.5243549278
2002	16942.2257732516
2003	18572.01423855
2004	18847.934164829
2005	18760.0124196585
2006	18154.8579548654
2007	17408.4447538448
2008	16583.1855657558
2009	16799.3776227431
2010	16825.3349370516
2011	17618.5275283132
2012	17542.7127438062
2013	17382.8975119657
2014	18223.0995634128
2015	17644.0755518331
2016	15931.8394460058
2017	15810.3887546688
2018	15681.9948384633