Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	2263000000
1981-01-01	2594000000
1982-01-01	3077000000
1983-01-01	3043000000
1984-01-01	3339000000
1985-01-01	410000000
1986-01-01	553000000
1987-01-01	751000000
1988-01-01	749000000
1989-01-01	731000000
1990-01-01	850000000
1991-01-01	795000000
1992-01-01	1117000000
1993-01-01	908000000
1994-01-01	919000000
1995-01-01	4298000000
1996-01-01	5070000000
1997-01-01	5826000000
1998-01-01	6546000000
1999-01-01	7907000000
2000-01-01	11993000000
2001-01-01	8322000000
2002-01-01	7071000000
2003-01-01	7604000000
2004-01-01	7091000000
2005-01-01	6987000000
2006-01-01	9137000000
2007-01-01	11131000000
2008-01-01	11382000000
2009-01-01	10813000000
2010-01-01	11446000000
2011-01-01	11327000000
2012-01-01	14066000000
2013-01-01	14445000000
2014-01-01	13922000000