Year	US Dollars, Sum Over Component Sub-periods
1981-01-01	133000000
1982-01-01	225000000
1983-01-01	292000000
1984-01-01	222000000
1985-01-01	310000000
1986-01-01	258000000
1987-01-01	385000000
1988-01-01	576000000
1989-01-01	682000000
1990-01-01	1093000000
1991-01-01	1482000000
1992-01-01	1777000000
1993-01-01	2004000000
1994-01-01	2109000000
1995-01-01	4346000000
1996-01-01	6194000000
1997-01-01	4677000000
1998-01-01	-240800000
1999-01-01	-1865620000
2000-01-01	-4550360000
2001-01-01	-2977400000
2002-01-01	145090000
2003-01-01	-596920000
2004-01-01	1896080000
2005-01-01	8336260000
2006-01-01	4914200000
2007-01-01	6928480000
2008-01-01	9318000000
2009-01-01	4878000000
2010-01-01	13771000000
2011-01-01	19242000000
2012-01-01	19138000000
2013-01-01	18444000000