Year	constant 2015 US$
1991	4287.308732547071
1992	4642.74243942302
1993	4821.201858307774
1994	5574.418275850643
1995	6167.247185322384
1996	6634.748498452655
1997	7396.089600613087
1998	8110.523277483062
1999	8562.340056105411
2000	9604.831941117844
2001	9905.010468143166
2002	10126.804510880158
2003	10304.89592441366
2004	11023.267532636195
2005	11379.640237083153
2006	11935.309722400823
2007	10682.594959690965
2008	10898.300492685945
2009	10495.743133110389
2010	10006.92755442079
2011	9942.371110260614
2012	9849.899535825036
2013	9474.400649538373
2014	9136.20015340524
2015	8799.694875037065
2016	9263.877533633255
2017	9644.57822856357
2018	10178.882549777281
2019	10272.868320077423
2020	8411.083739686503
2021	9091.560037118292
2022	10046.301589602983