Year	US Dollars, Sum Over Component Sub-periods
1979-01-01	1366000000
1980-01-01	1665000000
1981-01-01	2160000000
1982-01-01	1740000000
1983-01-01	1633000000
1984-01-01	1870000000
1985-01-01	2033000000
1986-01-01	1798000000
1987-01-01	1947000000
1988-01-01	2255000000
1989-01-01	3124000000
1990-01-01	3752000000
1991-01-01	3296000000
1992-01-01	4080000000
1993-01-01	3954000000
1994-01-01	4392000000
1995-01-01	4929000000
1996-01-01	5038000000
1997-01-01	6876000000
1998-01-01	7897000000
1999-01-01	7194000000
2000-01-01	9498000000
2001-01-01	9322000000
2002-01-01	9551000000
2003-01-01	10447000000
2004-01-01	12584000000
2005-01-01	16047000000
2006-01-01	19476000000
2007-01-01	23954000000
2008-01-01	30451000000
2009-01-01	27728000000
2010-01-01	31599000000
2011-01-01	38209000000
2012-01-01	39864000000
2013-01-01	39127000000
2014-01-01	40764000000