Year	US Dollars, Sum Over Component Sub-periods
1990-01-01	17141070000
1991-01-01	21016360000
1992-01-01	27279140000
1993-01-01	7332860000
1994-01-01	6783580000
1995-01-01	5609090000
1996-01-01	2990940000
1997-01-01	3626560000
1998-01-01	7375970000
1999-01-01	19007600000
2000-01-01	22727070000
2001-01-01	24262290000
2002-01-01	21717140000
2003-01-01	29362770000
2004-01-01	53771820000
2005-01-01	85752840000
2006-01-01	115249250000
2007-01-01	144534780000
2008-01-01	154531120000
2009-01-01	78085600000
2010-01-01	65715360000
2011-01-01	49693500000
2012-01-01	8892200000
2013-01-01	-23167110000