Year	current US$
1989	30763157894.73684
1992	32959618208.516888
1993	19499690073.496857
1994	18399156600.734264
1995	14922363341.62008
1996	12233604778.217068
1997	12351892399.14098
1998	10578304229.933596
1999	8600047839.916405
2000	5629170662.359498
2001	6421138847.005827
2002	7441297256.7057
2003	9124666584.656744
2004	11771385598.796766
2005	16516580681.63214
2006	20977227722.772278
2007	27373663366.336636
2008	29884259650.392494
2009	17402236357.755634
2010	18492398658.759552
2011	19923030417.20536
2012	22330290629.654827
2013	21222694858.00075
2014	16325024550.632772
2015	10835215025.632307
2016	11407271338.553204
2017	13428781100.86678
2018	15097006333.561907
2019	16601827104.810804
2020	15820555329.93312
2021	20542516948.775806
2022	12316995865.043869
2023	14742298594.009846