Year	US Dollars, Sum Over Component Sub-periods
1981-01-01	647000000
1982-01-01	791000000
1983-01-01	694000000
1984-01-01	639000000
1985-01-01	661000000
1986-01-01	924000000
1987-01-01	1098000000
1988-01-01	1155000000
1989-01-01	1122000000
1990-01-01	1409000000
1991-01-01	1464000000
1992-01-01	3131000000
1993-01-01	2877000000
1994-01-01	3025000000
1995-01-01	3336000000
1996-01-01	2831000000
1997-01-01	2860000000
1998-01-01	3054000000
1999-01-01	3146000000
2000-01-01	2916000000
2001-01-01	3397000000
2002-01-01	4052000000
2003-01-01	4960000000
2004-01-01	5167000000
2005-01-01	6115000000
2006-01-01	5624000000
2007-01-01	6733000000
2008-01-01	7320000000
2009-01-01	7614000000
2010-01-01	8391000000
2011-01-01	9536000000
2012-01-01	8786000000
2013-01-01	10786000000