Year	constant 2015 US$
1991	5200.0510582156485
1992	5082.681559315629
1993	4903.089461448836
1994	4819.7575754045665
1995	4806.267819781212
1996	4751.274770698443
1997	4780.5132071326025
1998	4873.641755405106
1999	4947.608761108616
2000	4950.840331673695
2001	4834.712718673328
2002	4833.523200740827
2003	4896.388599895156
2004	5002.150452152627
2005	5038.387685909485
2006	5170.4724746741285
2007	5358.534152354607
2008	5409.478866007069
2009	5344.7649359131265
2010	5403.620069621146
2011	5516.826267454898
2012	5506.000248978957
2013	5355.685605773141
2014	5408.102726568282
2015	5246.5043476408555
2016	5073.779974123744
2017	5114.516234380865
2018	4451.791162869855
2019	4504.785323168243
2020	4493.506134337575
2021	4634.288396029615
2022	4690.312610815874