Year	US Dollars, Sum Over Component Sub-periods
1970-01-01	-723280000
1971-01-01	-390160000
1972-01-01	695550000
1973-01-01	1345500000
1974-01-01	1441970000
1975-01-01	1651490000
1976-01-01	2307450000
1977-01-01	620320000
1978-01-01	-664000000
1979-01-01	-338360000
1980-01-01	94240000
1981-01-01	4689960000
1982-01-01	6475690000
1983-01-01	5997380000
1984-01-01	7063620000
1985-01-01	6962370000
1986-01-01	7507530000
1987-01-01	5978690000
1988-01-01	9860980000
1989-01-01	9531340000
1990-01-01	11863590000
1991-01-01	12050270000
1992-01-01	12250870000
1993-01-01	16936270000
1994-01-01	19199390000
1995-01-01	24442740000
1996-01-01	23219790000
1997-01-01	21332600000
1998-01-01	20426820000
1999-01-01	16357030000
2000-01-01	18514210000
2001-01-01	19829830000
2002-01-01	19079130000
2003-01-01	36847440000
2004-01-01	41514570000
2005-01-01	48712100000
2006-01-01	50039090000
2007-01-01	57270270000
2008-01-01	60768240000
2009-01-01	47778660000
2010-01-01	52942110000
2011-01-01	60087010000
2012-01-01	56462270000
2013-01-01	66582450000