Year	US Dollars, Sum Over Component Sub-periods
1987-01-01	2644600000
1988-01-01	3144800000
1989-01-01	3168300000
1990-01-01	3319600000
1991-01-01	3425200000
1992-01-01	3581100000
1993-01-01	3489500000
1994-01-01	3981400000
1995-01-01	4659600000
1996-01-01	4854700000
1997-01-01	4855400000
1998-01-01	4460700000
1999-01-01	4542900000
2000-01-01	4524400000
2001-01-01	4366600000
2002-01-01	4815300000
2003-01-01	5785900000
2004-01-01	7282900000
2005-01-01	8340900000
2006-01-01	8047900000
2007-01-01	9460100000
2008-01-01	10123600000
2009-01-01	8418100000
2010-01-01	10022600000
2011-01-01	11833100000
2012-01-01	12139500000
2013-01-01	12310800000