Year	US Dollars, Sum Over Component Sub-periods
1990-01-01	11854790000
1991-01-01	12097570000
1992-01-01	12421740000
1993-01-01	11721930000
1994-01-01	14846570000
1995-01-01	17447880000
1996-01-01	18952880000
1997-01-01	18209520000
1998-01-01	19805700000
1999-01-01	20448780000
2000-01-01	19380890000
2001-01-01	20559600000
2002-01-01	21307580000
2003-01-01	26323790000
2004-01-01	27027010000
2005-01-01	27640050000
2006-01-01	27909260000
2007-01-01	31555910000
2008-01-01	37706680000
2009-01-01	34776120000
2010-01-01	37137460000
2011-01-01	49058940000
2012-01-01	48269400000
2013-01-01	54254710000