Year	including construction (constant 2010 US$)
1991	15930.7247245886
1992	15787.3617009842
1993	15981.8008678002
1994	16653.9406771134
1995	16162.3946539527
1996	15515.9589067806
1997	15352.0538165679
1998	14479.6214614208
1999	13332.0433220036
2000	14456.9989471667
2001	15015.1646724402
2002	16185.7258992698
2003	17144.9366256547
2004	19172.060434765
2005	19904.572525318
2006	18836.5616370419
2007	18537.3066998614
2008	19314.4143056027
2009	19486.7063115948
2010	20222.0849214438
2011	22328.8034701184
2012	23580.7331548511
2013	22307.9958983786
2014	21806.5397113174
2015	20803.6796986806
2016	20766.781292645
2017	20033.7212037287
2018	19564.461683712