Year	constant 2015 US$
1991	3894.6969072235884
1992	3866.405248013258
1993	3731.8191742499625
1994	3655.6193490645524
1995	3660.060266759582
1996	3500.8695997685313
1997	3550.5509304448437
1998	3636.8869202771243
1999	3570.425216477598
2000	3494.2494756602937
2001	3488.6463829077857
2002	3522.385430436226
2003	3530.160882823833
2004	3564.9422160802433
2005	3608.65244088767
2006	3686.539576189161
2007	3856.184243650422
2008	4064.2228280079366
2009	4142.2357524312865
2010	4004.7463813894083
2011	4041.366452501823
2012	4081.6804439565185
2013	4264.193976447312
2014	4299.313529962622
2015	4236.747524651108
2016	4161.971598050205
2017	4058.955619683002
2018	4030.0855225848277
2019	4032.878980359995
2020	3984.9974190066705
2021	3970.786809647586
2022	3979.311206475222