Year	current US$
1995	7420000000
1996	7626000000
1997	6987000000
1998	6814000000
1999	5767000000
2000	5746000000
2001	5451000000
2002	5841000000
2003	7287000000
2004	8561000000
2005	9287000000
2006	9728000000
2007	10634000000
2008	11464000000
2009	11529000000
2010	11805000000
2011	14533000000
2012	16018000000
2013	17024000000
2014	17781000000
2015	17207000000
2016	17619000000
2017	19099000000
2018	19054000000
2019	18754000000
2020	9546000000