Year	US Dollars, Sum Over Component Sub-periods
1980-01-01	185000000
1981-01-01	155000000
1982-01-01	139000000
1983-01-01	99000000
1984-01-01	104000000
1985-01-01	145000000
1986-01-01	106000000
1987-01-01	92000000
1988-01-01	259000000
1989-01-01	964000000
1990-01-01	1305000000
1991-01-01	2034000000
1992-01-01	2147000000
1993-01-01	2194000000
1994-01-01	2392000000
1995-01-01	4123000000
1996-01-01	4328000000
1997-01-01	4665000000
1998-01-01	3416000000
1999-01-01	4552000000
2000-01-01	5934000000
2001-01-01	7072000000
2002-01-01	8932000000
2003-01-01	10764000000
2004-01-01	11583000000
2005-01-01	12486000000
2006-01-01	13680000000
2007-01-01	14685000000
2008-01-01	14744000000
2009-01-01	13412000000
2010-01-01	16503000000
2011-01-01	17756000000
2012-01-01	19118000000
2013-01-01	18047000000