Year	constant 2015 US$
1991	3990.810599392724
1992	3885.4193941405533
1993	3680.3810151706425
1994	3581.9364260648354
1995	3610.9750115186757
1996	3491.5518540793128
1997	3559.5404719219323
1998	3574.095415319522
1999	3531.9144626036964
2000	3458.2692567572394
2001	3479.9657245840103
2002	3409.9660045708033
2003	3461.3186774627056
2004	3536.5226069042074
2005	3609.98321001412
2006	3610.768793265422
2007	3736.0663515767305
2008	3940.6360731634218
2009	3885.801369923306
2010	3903.2193312812647
2011	3864.5109133984015
2012	3823.2661198156957
2013	3896.4008406155967
2014	3907.0761789241765
2015	3824.662237722105
2016	3844.0725454191866
2017	3800.0815559670486
2018	3731.7982687882704
2019	3722.7603846386914
2020	3664.659868910818
2021	3658.543092040092
2022	3642.893352713307