Year	US Dollars, Sum Over Component Sub-periods
1987-01-01	6628990000
1988-01-01	6663070000
1989-01-01	7876650000
1990-01-01	8273850000
1991-01-01	7503880000
1992-01-01	8118640000
1993-01-01	8726500000
1994-01-01	10598090000
1995-01-01	12576490000
1996-01-01	13809490000
1997-01-01	13373490000
1998-01-01	11335680000
1999-01-01	13046250000
2000-01-01	12868940000
2001-01-01	12459960000
2002-01-01	14321040000
2003-01-01	17310560000
2004-01-01	22157520000
2005-01-01	25124870000
2006-01-01	25042190000
2007-01-01	29499480000
2008-01-01	33077400000
2009-01-01	24053600000
2010-01-01	29828430000
2011-01-01	36056010000
2012-01-01	37735090000
2013-01-01	38799940000