Year	current US$
1988	151298026998.96158
1989	171441202475.6852
1990	155778491171.7496
1991	187851851851.85184
1992	159322033898.30508
1993	117503805175.03806
1994	100892683873.47176
1995	100620223723.55742
1996	92711097237.39659
1997	88988764044.94382
1998	40546110252.44719
1999	29053614947.1974
2000	48549591183.78955
2001	67298594446.34898
2002	69196172248.80382
2003	89765989699.27855
2004	123530024297.11906
2005	153395283527.24796
2006	209584377277.18164
2007	314067029451.1381
2008	423536512375.3288
2009	231402556959.1874
2010	344860686023.39014
2011	496355957477.9967
2012	542217627586.8697
2013	533496346280.30707
2014	461081988535.8375
2015	301993923297.00934
2016	294879201814.9982
2017	371617399719.9757
2018	363254798096.5063
2019	383685489518.3264
2020	350213330831.793
2021	418619143756.71204
2022	516494560220.25977
2023	519456986030.67224