Year	US Dollars, Sum Over Component Sub-periods
1979-01-01	6844000000
1980-01-01	8426000000
1981-01-01	11658000000
1982-01-01	15035000000
1983-01-01	11763000000
1984-01-01	12755000000
1985-01-01	12949000000
1986-01-01	12118000000
1987-01-01	10986000000
1988-01-01	12971000000
1989-01-01	13976000000
1990-01-01	12931000000
1991-01-01	10648000000
1992-01-01	9268000000
1993-01-01	11639000000
1994-01-01	11296000000
1995-01-01	14427000000
1996-01-01	16904000000
1997-01-01	20035000000
1998-01-01	22787000000
1999-01-01	22783000000
2000-01-01	21507000000
2001-01-01	23023000000
2002-01-01	21486000000
2003-01-01	21891000000
2004-01-01	23719000000
2005-01-01	29162000000
2006-01-01	33942000000
2007-01-01	40784000000
2008-01-01	53073000000
2009-01-01	42510000000
2010-01-01	46892000000
2011-01-01	58072000000
2012-01-01	46335000000
2013-01-01	49848000000
2014-01-01	46650000000