Year	constant 2015 US$
1980	3431.521297137653
1981	3587.69478063472
1982	3660.6072922888993
1983	3776.740823041425
1984	3895.889720713863
1985	4000.492544054279
1986	4169.923055214613
1987	4415.8906575572155
1988	4893.694038388993
1989	4788.3968786260775
1990	4431.028876293165
1991	4097.192110025014
1992	3840.2463817571484
1993	3813.7020781192577
1994	3896.244277254659
1995	4025.6458265701817
1996	4257.095099977785
1997	3678.516597775807
1998	3843.46219983665
1999	3540.5560797855464
2000	3721.3034908875266
2001	3941.2756908212864
2002	4264.271700756933
2003	4523.286223013523
2004	4854.273386841048
2005	5236.086372343693
2006	5634.911209413215
2007	6054.232484861933
2008	6470.5897344519
2009	6294.433391634013
2010	6434.552431216793
2011	6611.303844651119
2012	6699.503001424439
2013	6700.5359875246595
2014	6802.71032404882
2015	7078.860322989693
2016	7344.443502777567
2017	7601.438474005965
2018	7862.861829800468
2019	8237.926782904817
2020	7958.82683957222
2021	8638.718376405799
2022	9550.942549657073
2023	9779.822063793641