Year	constant 2015 US$
1991	29444.4195548767
1992	31126.770623060387
1993	30471.071058359314
1994	31306.25356972693
1995	33641.101222416204
1996	32505.692228651435
1997	32253.891215323863
1998	32748.76294366761
1999	33732.15881353064
2000	35270.981094688446
2001	34094.143530223366
2002	33924.57259604541
2003	33103.99217454412
2004	34514.515240389
2005	35657.07527570401
2006	35306.72026273522
2007	35529.04755031943
2008	36699.08960339423
2009	36348.7792171936
2010	36179.5883169141
2011	37507.47089403937
2012	37310.9558564658
2013	35599.883213614834
2014	34901.731479542206
2015	35700.4823517052
2016	37204.58793791888
2017	37323.21901082194
2018	36768.845213373505
2019	38330.79639696405
2020	37747.38048537894
2021	40436.79982095925
2022	40813.19568382587