Year	constant 2015 US$
1990	5593.280143463233
1991	4405.332744754399
1992	4788.598206351168
1993	4843.125128494391
1994	5043.843527350512
1995	5278.204683293809
1996	5678.353618320892
1997	5851.218520062743
1998	5833.343354458028
1999	6025.988814169984
2000	6134.937685718088
2001	6343.144985912611
2002	6552.002987643799
2003	6889.418960632408
2004	7085.396185990869
2005	7328.728073830052
2006	7583.116266163609
2007	7851.090960880827
2008	8019.4167529855895
2009	7936.26831373507
2010	8020.522819231723
2011	8035.4228267681065
2012	7937.539182159341
2013	8007.07712511488
2014	8111.1966384808175
2015	8408.415322501616
2016	8709.774347116607
2017	9037.940281711484
2018	9323.75162616722
2019	9536.652084028337
2020	8824.945006469443
2021	9355.642436746337
2022	9150.940960734419
2023	8698.71141955277