Year	US Dollars, Sum Over Component Sub-periods
1988-01-01	9229740000
1989-01-01	9227950000
1990-01-01	11847190000
1991-01-01	13075810000
1992-01-01	13187670000
1993-01-01	12241100000
1994-01-01	12323000000
1995-01-01	13911600000
1996-01-01	15147160000
1997-01-01	14277250000
1998-01-01	15275420000
1999-01-01	20406130000
2000-01-01	24472220000
2001-01-01	26927180000
2002-01-01	27115740000
2003-01-01	31395460000
2004-01-01	36557790000
2005-01-01	43489160000
2006-01-01	52196100000
2007-01-01	61399600000
2008-01-01	72443390000
2009-01-01	56104240000
2010-01-01	62077930000
2011-01-01	66800250000
2012-01-01	65179740000
2013-01-01	70627700000