Year	including construction (constant 2015 US$)
2004	20316.27092381477
2005	19078.50199146767
2006	17153.82924031301
2007	15493.968701210795
2008	13434.129881245615
2009	12587.87877327261
2010	11692.182214911536
2011	11268.97754505527
2012	10326.667011550157
2013	10132.359729703974
2014	9942.638975436974
2015	10431.74028036402
2016	9230.437294516467
2017	7811.17383858064
2018	7759.701370787004
2019	7934.244111449352
2020	7513.041367555697
2021	6818.068177017919
2022	6647.355534700636