Year	current US$
1988	1117658150.30448
1989	934655679.362889
1990	915408921.322214
1991	1058544556.26511
1992	1044254786.062
1993	1025199528.45833
1994	1019151754.76465
1995	1182265779.37635
1996	1385976818.78962
1997	1462037707.19533
1998	2150664235.35037
1999	2090664533.09573
2000	2049142929.27187
2001	1910261052.19684
2002	1829551195.80285
2003	1884259995.53779
2004	1990123307.03285
2005	2001082217.49973
2006	2000708186.72287
2007	2423637980.21713
2008	3445525418.65877
2009	4301218967.96502
2010	5349571268.27057
2011	6412376805.41546
2012	9273582906.14641
2013	8897983839.51943
2014	8545961886.21345
2015	6831178414.99031
2016	6565109141.53824
2017	6352952804.35405
2018	5869721066.76825
2019	6567331256.61049
2020	6194833323.89753
2021	6180409520.00941