Year	current US$
1995	99000000
1996	141000000
1997	77000000
1998	91000000
1999	54000000
2000	35000000
2001	57000000
2002	65000000
2003	74000000
2004	104000000
2005	273000000
2006	368000000
2007	463000000
2008	634000000
2009	458000000
2010	495000000
2011	597000000
2012	438000000
2013	458000000
2014	401000000
2015	388000000
2016	442000000
2017	474000000
2018	491000000
2019	668000000
2020	178000000