Year	constant 2010 US$
1993	18908.3137608759
1994	18604.3831993984
1995	18416.7114558126
1996	18594.5166398489
1997	17717.7209635202
1998	17903.8464978865
1999	18390.9535004597
2000	18617.9282826028
2001	18791.0927064895
2002	18929.0316787202
2003	18759.4154055607
2004	19284.185426641
2005	19372.9103819578
2006	19558.6045093715
2007	20005.3764785748
2008	20023.984071112
2009	19047.6343939892
2010	19429.2972187743
2011	19517.6499955958
2012	19810.7658283876
2013	20139.9569792273
2014	19911.514265053
2015	19873.8474472149
2016	19120.1777950899
2017	17781.8741970534
2018	14697.2371988097