Year	current US$
1991	20230769230.76923
1992	25461086637.29809
1993	23825378553.085983
1994	18566526827.692482
1995	12865003833.836994
1996	10101838183.647823
1997	10755466471.285273
1998	8718773019.609379
1999	5530703082.139877
2000	6411490096.10434
2001	8574672846.745221
2002	8875038133.9028
2003	11412443405.652084
2004	14180673058.845648
2005	20084574228.217724
2006	27459603960.39604
2007	41320000000
2008	51528310659.45401
2009	20747018446.357704
2010	25943468446.58634
2011	34618615503.88745
2012	35814786806.5552
2013	31290879519.57963
2014	17884840475.359814
2015	14504251786.863796
2016	20280780643.39028
2017	22378569656.59453
2018	24330479022.217686
2019	22913735879.65049
2020	13989563729.962738
2021	28901031213.99621
2022	19622258180.632908
2023	27047251869.433723