Year	US Dollars, Sum Over Component Sub-periods
1970-01-01	-419800000
1971-01-01	-110900000
1972-01-01	1370500000
1973-01-01	2400800000
1974-01-01	2355200000
1975-01-01	2096600000
1976-01-01	2857400000
1977-01-01	935400000
1978-01-01	-1150800000
1979-01-01	-1834600000
1980-01-01	-1788300000
1981-01-01	2627100000
1982-01-01	4844900000
1983-01-01	4637600000
1984-01-01	5379900000
1985-01-01	4565800000
1986-01-01	4411300000
1987-01-01	3916900000
1988-01-01	6847700000
1989-01-01	9125300000
1990-01-01	8017700000
1991-01-01	7474200000
1992-01-01	6815700000
1993-01-01	13239800000
1994-01-01	17803500000
1995-01-01	26423100000
1996-01-01	21921700000
1997-01-01	25454100000
1998-01-01	13104200000
1999-01-01	16061000000
2000-01-01	7875000000
2001-01-01	10425900000
2002-01-01	11589300000
2003-01-01	29864200000
2004-01-01	46551600000
2005-01-01	47220800000
2006-01-01	63308900000
2007-01-01	52602000000
2008-01-01	37272700000
2009-01-01	41221300000
2010-01-01	57370600000
2011-01-01	75616500000
2012-01-01	73465900000
2013-01-01	87076600000