Year	current US$
1996	2005890000
1997	16641350000
1998	14802530000
1999	6513240000
2002	7062060000
2003	6833180000
2004	3199500000
2006	7689900000
2007	8682600000
2008	10182650000
2010	15047426000
2011	19988300000
2012	35621030000
2013	16837520000
2014	17148840000
2015	11299970000
2016	19080500000
2017	14373300000
2018	10347060000
2019	11497380000
2020	10547720000