Year	current US$
1995	162000000
1996	93000000
1997	136000000
1998	175000000
1999	234000000
2000	222000000
2001	230000000
2002	319000000
2003	457000000
2004	581000000
2005	562000000
2006	538000000
2007	546000000
2008	510000000
2009	663000000
2010	438000000
2011	465000000
2012	513000000
2013	481000000
2014	528000000
2015	533000000
2016	503000000
2017	542000000
2018	582000000
2019	705000000
2020	211000000