Year	constant 2015 US$
1991	2417.33349401501
1992	1545.6160155955608
1993	1411.8340914408575
1994	2255.5569071939162
1995	1254.8315723342812
1996	2139.7337037890056
1997	1582.9405403461044
1998	1949.8873139835916
1999	1613.5589280318798
2000	1369.071808756654
2001	1580.3231048907348
2002	1603.323411075506
2003	1918.001891650033
2004	1857.295183705073
2005	1632.1343994114943
2006	1998.0740381872113
2007	1625.5692444167578
2008	1942.3403602441565
2009	2395.3564812446393
2010	2423.280163163316
2011	2576.009769468074
2012	2408.0779576532364
2013	2892.745494921287
2014	2872.2414707183334
2015	3353.2714177146127
2016	2803.5889758749217
2017	3500.9582215961877
2018	3692.406720601206
2019	3577.325481551437
2020	3487.4945380812997
2021	4126.395206770529
2022	3637.662791067538