Year	constant 2015 US$
1991	8727.589840025455
1992	8667.310368008182
1993	8587.809576054477
1994	8546.879751287684
1995	8419.295212448207
1996	8631.29798871555
1997	8867.799475627173
1998	8898.011954390553
1999	9084.356907359675
2000	9307.606702714735
2001	9489.56169348321
2002	9659.75884258658
2003	9865.497638650402
2004	10140.334762635463
2005	10589.042274167776
2006	11162.719132746843
2007	12017.581543350852
2008	12530.966794439453
2009	12717.544384935129
2010	13360.141051547473
2011	13808.431482170803
2012	14321.591380654068
2013	14543.348589215257
2014	14782.132660842592
2015	15032.801290271062
2016	15460.117236414726
2017	16062.25004691524
2018	16626.480372972495
2019	17064.28754441869
2020	17459.189428752947
2021	18217.30492930352
2022	18545.832874810145