Year	current US$
1993	12651700000
1994	12927800000
1995	9459210000
1996	11660460000
1997	11805320000
1998	5418610000
1999	7007800000
2000	6624600000
2001	4903400000
2004	45595630000
2005	45317280000
2006	44906480000
2007	69715390000
2008	23354040000
2009	31886980000
2010	38007180000
2011	32567930000
2018	55503510000
2019	50561890000
2020	50278510000
2021	43096600000
2022	28713900000