Year	current US$
1989	8187.000600682685
1990	8828.05228123721
1991	10328.675299262766
1992	11069.696874429665
1993	10536.441789661098
1994	10370.152082493501
1995	11706.001974685905
1996	12023.722177381056
1997	11941.89117800134
1998	9834.46953958704
1999	10418.716740062317
2000	11952.89207488195
2001	11709.594729948201
2002	12199.432818197592
2003	13066.521235453769
2004	15181.593522143865
2005	17312.760458027853
2006	19666.293228112005
2007	21657.464773453696
2008	25813.6696846326
2009	20726.989505961195
2010	24672.509686539557
2011	30854.48319622596
2012	32986.94271238878
2013	32969.1945410304
2014	31088.4987672382
2015	25264.398318713116
2016	23378.56503415365
2017	23966.157122531582
2018	23763.63267855409
2019	24219.103258821633
2020	22442.284665552303
2021	23060.068131806373