Year	US Dollars, Sum Over Component Sub-periods
1990-01-01	13838710000
1991-01-01	12445160000
1992-01-01	13350680000
1993-01-01	9571570000
1994-01-01	9275810000
1995-01-01	8070700000
1996-01-01	9645040000
1997-01-01	8937100000
1998-01-01	14174780000
1999-01-01	18744670000
2000-01-01	39586190000
2001-01-01	28430490000
2002-01-01	39277460000
2003-01-01	25844700000
2004-01-01	24776150000
2005-01-01	25004650000
2006-01-01	30819540000
2007-01-01	64277840000
2008-01-01	76845350000
2009-01-01	10407210000
2010-01-01	39872590000
2011-01-01	28386950000
2012-01-01	25705960000
2013-01-01	39159390000