Year	constant 2015 US$
1990	2891.397731048727
1991	2855.3834328850203
1992	2575.6020079459454
1993	2374.607950667514
1994	2091.5742564590355
1995	1881.2733190723309
1996	1943.7684999934047
1997	2168.9395382264233
1998	2361.4596988445746
1999	2464.0878140550717
2000	2610.393944310319
2001	2748.680660883479
2002	2908.6683157175553
2003	3143.3307521357465
2004	3521.4284040758425
2005	3886.771247178783
2006	4284.592104738723
2007	4650.6651176809855
2008	5122.290867348819
2009	5107.879776526357
2010	5525.010944579619
2011	5876.997905347279
2012	5915.209184670429
2013	5898.77796026491
2014	6028.365229341551
2015	5714.143432064386
2016	5544.6572948592975
2017	5745.636280497208
2018	5944.836836996058
2019	6082.366956897778
2020	5994.192300269261
2021	6209.991846854825
2022	5948.815975108319
2023	6239.721120576773