Year	constant 2015 US$
1991	5051.432796935672
1992	5178.4440022595245
1993	5416.5318181755965
1994	4346.684286944154
1995	5325.501746735452
1996	5739.931265260993
1997	4372.229940373745
1998	4380.729264131719
1999	4464.76662953123
2000	3921.682314694161
2001	3607.397937371291
2002	3301.216742214461
2003	4106.324393869496
2004	3203.3307543056017
2005	3674.8607232676104
2006	3330.3886357249585
2007	3534.7982439436605
2008	3786.7657977630856
2009	3733.144884665605
2010	3962.2220855502956
2011	3894.769371048036
2012	4193.590146913282
2013	4161.92048515819
2014	4067.162878195073
2015	4539.779343420018
2016	4769.287235713763
2017	5383.264990723512
2018	5225.914453930962
2019	5032.384045822302
2020	4920.581535306144
2021	4719.185926709996
2022	5167.8537048336375