Year	current US$
1992	2735000000
1993	2722000000
1994	2550000000
1995	3430000000
1996	4210000000
1997	4025000000
1998	3530000000
1999	3235000000
2000	2817000000
2001	2708000000
2002	2513000000
2003	3189000000
2004	4280000000
2005	4749000000
2006	5617000000
2007	8029000000
2008	10298000000
2009	10735000000
2010	11695000000
2011	13254000000
2012	11210000000
2013	12000000000
2014	11500000000
2015	9443000000
2016	8974000000
2017	10079000000
2018	10921000000
2019	14930000000
2020	13281000000
2021	14092000000
2022	15287000000
2023	20045000000