Year	current US$
1995	2278000000
1996	2285000000
1997	2080000000
1998	2062000000
1999	2035000000
2000	1852000000
2001	1852000000
2002	2008000000
2003	2435000000
2004	2823000000
2005	3056000000
2006	3424000000
2007	3983000000
2008	4544000000
2009	4404000000
2010	4305000000
2011	4882000000
2012	4887000000
2013	5297000000
2014	5305000000
2015	4796000000
2016	5191000000
2017	5610000000
2018	6072000000
2019	5678000000
2020	1646000000