Year	current US$
1992	6467100000
1993	13372900000
1994	8866980000
1995	13126500000
1996	14408390000
1997	34401250000
1998	22161130000
1999	13576740000
2000	18553900000
2001	13277070000
2002	10737830000
2003	16440520000
2004	7847260000
2005	11584110000
2006	17410160000
2007	22565650000
2008	31791660000
2009	55263830000
2010	59970437000
2011	62250680000
2012	72545750000
2013	45339130000
2014	33144270000
2015	34238935000
2016	38248141000
2017	40687570000
2018	27922250000
2019	21985400000
2020	19966570000
2021	16794260000
2022	19207230000