Year	constant 2015 US$
1994	9637.880198407294
1995	9477.651479326258
1996	10062.927824228205
1997	10492.550692036282
1998	11042.112877447467
1999	11405.145451552715
2000	12442.300328957148
2001	12153.078228153714
2002	12879.43650999317
2003	12663.257235189287
2004	14349.671727416631
2005	14232.888029327816
2006	14651.51505265462
2007	15014.613887856365
2008	16173.727821560647
2009	16331.996364788172
2010	15824.220311556921
2011	16230.838527449336
2012	15885.914086564355
2013	16480.883676500212
2014	17313.004017431842
2015	21895.05566581103
2016	17272.53972431337
2017	17563.39675586779
2018	17532.100863155007
2019	18088.735247277764
2020	18766.380410370046
2021	18558.499675521398
2022	18768.494186970547