Year	current US$
1989	2875.577714850471
1990	2554.36863119854
1991	2233.87265114364
1992	2105.1330777876906
1993	2324.476145318939
1994	3263.560236646203
1995	4704.959837079646
1996	5121.905407344642
1997	5240.127175729763
1998	5049.764669143534
1999	3456.4233025407416
2000	3726.811669097163
2001	3142.235139749079
2002	2824.7154130003833
2003	3056.649797694944
2004	3623.224461664854
2005	4773.268551322605
2006	5866.023414271646
2007	7323.191593758182
2008	8801.75787553359
2009	8569.902547360716
2010	11249.291890435203
2011	13200.55623487894
2012	12327.513101305676
2013	12258.565709186587
2014	12071.404463729563
2015	8783.2154236384
2016	8680.736468738784
2017	9896.718895005282
2018	9121.020994803766
2019	8845.324149322636
2020	6923.699911768198
2021	7794.88097933152
2022	9065.497333954045
2023	10043.623922156732