Year	constant 2015 US$
1991	19658.2138508533
1992	20212.491363749254
1993	19243.5897490589
1994	18383.01571870742
1995	18075.710788888086
1996	18335.508859002202
1997	18733.968865628634
1998	19535.154442879335
1999	19256.333423599743
2000	19181.24184201826
2001	19396.224480597677
2002	18883.42612891457
2003	19122.220338442028
2004	19794.42122412647
2005	20613.068735587705
2006	22673.191254768346
2007	24943.81888576721
2008	27100.8705390013
2009	26946.82403736194
2010	27788.599364031284
2011	29885.30443101656
2012	30286.064529941836
2013	31109.719716743486
2014	31341.850813432717
2015	30819.37593752294
2016	31697.399589119716
2017	32759.456116337635
2018	32677.158917472443
2019	32794.7242291363
2020	34112.31805982452
2021	35229.331380264826
2022	36690.678486983794