Year	constant 2015 US$
1991	8671.079165436084
1992	9202.2650339604
1993	10046.752512475723
1994	11101.768377274182
1995	11787.878110239017
1996	12514.736927992459
1997	13086.321519090876
1998	13412.723717031975
1999	13634.0147473088
2000	12550.447024867453
2001	13279.94972624543
2002	14163.878882748662
2003	14858.771706306105
2004	13920.633422675819
2005	13760.769865497785
2006	14352.92727679521
2007	14610.652004686512
2008	14992.228565444353
2009	14723.8306192565
2010	15985.697120870565
2011	16214.97588552971
2012	15869.605756714736
2013	16426.728889250997
2014	16578.000570033513
2015	15796.563808389948
2016	16686.997349883703
2017	16545.593500861338
2018	16242.035757507676
2019	16664.06205529806
2020	17504.250118182335
2021	18242.871907322267
2022	18677.096291165675