Year	US Dollars, Sum Over Component Sub-periods
1975-01-01	1080870000
1976-01-01	1213590000
1977-01-01	1407820000
1978-01-01	1804030000
1979-01-01	2171990000
1980-01-01	2645450000
1981-01-01	2824770000
1982-01-01	2626430000
1983-01-01	2435010000
1984-01-01	2301760000
1985-01-01	2298150000
1986-01-01	2563370000
1987-01-01	3252540000
1988-01-01	3688580000
1989-01-01	3918420000
1990-01-01	4503010000
1991-01-01	4104330000
1992-01-01	4633770000
1993-01-01	4405690000
1994-01-01	5452900000
1995-01-01	7405070000
1996-01-01	7130100000
1997-01-01	6653890000
1998-01-01	6690710000
1999-01-01	6529130000
2000-01-01	7686080000
2001-01-01	9206080000
2002-01-01	10417690000
2003-01-01	11465210000
2004-01-01	15172690000
2005-01-01	16984290000
2006-01-01	17362130000
2007-01-01	23063320000
2008-01-01	31714330000
2009-01-01	27740110000
2010-01-01	27002930000
2011-01-01	29095290000
2012-01-01	29255590000
2013-01-01	30364560000