Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	720000000
1981-01-01	770000000
1982-01-01	795000000
1983-01-01	822000000
1984-01-01	790000000
1985-01-01	997000000
1986-01-01	1475000000
1987-01-01	1931000000
1988-01-01	2551000000
1989-01-01	2097000000
1990-01-01	2454000000
1991-01-01	2837000000
1992-01-01	3239000000
1993-01-01	3382000000
1994-01-01	3672000000
1995-01-01	4104000000
1996-01-01	4279000000
1997-01-01	5288000000
1998-01-01	6737000000
1999-01-01	6421000000
2000-01-01	6500000000
2001-01-01	6687000000
2002-01-01	7314000000
2003-01-01	7859000000
2004-01-01	9151000000
2005-01-01	10004000000
2006-01-01	9588000000
2007-01-01	11158000000
2008-01-01	14070000000
2009-01-01	12700000000
2010-01-01	13424000000
2011-01-01	15123000000
2012-01-01	15932000000
2013-01-01	17258000000