Year	current US$
1996	6552280000
1997	11829590000
1998	9954900000
1999	21186610000
2001	12670380000
2004	142261280000
2005	141911340000
2006	129817430000
2007	118376670000
2008	59805780000
2009	22312560000
2010	17579030000
2011	14499640000
2012	17076900000
2013	8595500000
2014	6752020000
2020	22259000000
2021	23180780000
2022	10203070000