Year	US Dollars, Sum Over Component Sub-periods
1988-01-01	30364800000
1989-01-01	32805600000
1990-01-01	46391300000
1991-01-01	43379500000
1992-01-01	53986500000
1993-01-01	48902700000
1994-01-01	59958800000
1995-01-01	63142000000
1996-01-01	72601100000
1997-01-01	76090300000
1998-01-01	69715500000
1999-01-01	58712100000
2000-01-01	56463200000
2001-01-01	57678000000
2002-01-01	59880400000
2003-01-01	71650100000
2004-01-01	84726300000
2005-01-01	89354000000
2006-01-01	98829300000
2007-01-01	111954300000
2008-01-01	115169600000
2009-01-01	93101500000
2010-01-01	98120300000
2011-01-01	105919300000
2012-01-01	105077400000
2013-01-01	110820200000