Year	US Dollars, Sum Over Component Sub-periods
1972-01-01	881940000
1973-01-01	1191290000
1974-01-01	1366840000
1975-01-01	1591930000
1976-01-01	1755710000
1977-01-01	1967480000
1978-01-01	2878690000
1979-01-01	3359050000
1980-01-01	3453440000
1981-01-01	3350220000
1982-01-01	3465580000
1983-01-01	3485910000
1984-01-01	3421130000
1985-01-01	3768590000
1986-01-01	5046620000
1987-01-01	6332020000
1988-01-01	7097000000
1989-01-01	7033320000
1990-01-01	8722520000
1991-01-01	8665720000
1992-01-01	9509260000
1993-01-01	9221780000
1994-01-01	10308980000
1995-01-01	12130100000
1996-01-01	12712920000
1997-01-01	11243930000
1998-01-01	12252370000
1999-01-01	13061300000
2000-01-01	12798670000
2001-01-01	12280860000
2002-01-01	12906800000
2003-01-01	14807260000
2004-01-01	19495860000
2005-01-01	22832640000
2006-01-01	23520740000
2007-01-01	28013670000
2008-01-01	30805090000
2009-01-01	34278070000
2010-01-01	36586500000
2011-01-01	45437760000
2012-01-01	46922840000
2013-01-01	52939880000