Year	current US$
1995	162000000
1996	159000000
1997	145000000
1998	128000000
1999	95000000
2000	88000000
2001	91000000
2002	76000000
2003	81000000
2004	87000000
2005	96000000
2006	112000000
2007	121000000
2008	128000000
2009	225000000
2010	243000000
2011	261000000
2012	291000000
2013	299000000
2014	314000000
2015	348000000
2016	356000000
2017	399000000
2018	393000000
2019	409000000
2020	104000000