Year	constant 2015 US$
1995	3492.7690095495213
1996	3713.2096477416553
1997	3806.5071306149152
1998	3944.9523478813608
1999	4079.6474285349223
2000	4220.916749255331
2001	4419.327677868611
2002	4679.047213946689
2003	4902.699350773785
2004	5210.573128162039
2005	5465.18217162262
2006	5785.324779564268
2007	6214.297803349553
2008	6523.268764957048
2009	6380.891414515662
2010	6430.529101412416
2011	6567.553293437924
2012	6620.313567182863
2013	6581.595918249183
2014	6763.083119661763
2015	7035.604909564978
2016	7344.045894024344
2017	7796.677402065177
2018	8209.100073243679
2019	8510.28257884502
2020	8218.708024924834
2021	8796.974178201457
2022	9341.726780497402
2023	9310.060646000056