Year	constant 2011 international $
1990	13468.8699795933
1991	12658.7082134508
1992	11335.282675035
1993	10677.8296129913
1994	9639.39030648365
1995	9524.08081301746
1996	9536.50400666757
1997	9803.91140717391
1998	9695.88681272323
1999	9953.59476942759
2000	10714.7321292098
2001	11050.2606443711
2002	11613.6761502619
2003	12347.7361722678
2004	13316.9531852183
2005	14190.1555006356
2006	15317.2969914874
2007	16484.5464680496
2008	17198.3132771604
2009	16264.1462614413
2010	16951.3793659337
2011	17804.138504329
2012	18302.676918879
2013	18828.5860856442
2014	19121.6980597317
2015	19167.5035078207
2016	19410.4394296827
2017	20057.2489683398
2018	20580.3024854443