Year	constant 2015 US$
1990	3354.1307709201365
1991	4098.108833844233
1992	4763.304735656605
1993	5096.782435717478
1994	5477.271449088228
1995	5768.506049051303
1996	6229.134184558156
1997	6133.569579135528
1998	6181.322068862072
1999	6067.55375602852
2000	6088.856006681744
2001	6081.510255189739
2002	5936.250802587039
2003	5260.304703789676
2004	6409.630384399609
2005	6690.425631039624
2006	6790.884502551346
2007	7444.93946347174
2008	7874.60975588573
2009	8397.28979378897
2010	8923.303370171989
2011	8981.470902827927
2012	8985.003760821082
2013	8506.254953055883
2014	7831.594106789185
2015	7723.283518335212
2016	7963.932428061094
2017	8343.944280945167
2018	8252.266199171072
2019	7867.233469754022
2020	6263.073130240924
2021	5712.084204568785
2022	6037.004710942632
2023	6117.228145700574