Year	US Dollars, Sum Over Component Sub-periods
1987-01-01	7213020000
1988-01-01	8829600000
1989-01-01	8814480000
1990-01-01	9185690000
1991-01-01	9581090000
1992-01-01	9725590000
1993-01-01	10444780000
1994-01-01	11953680000
1995-01-01	13394760000
1996-01-01	14308240000
1997-01-01	14250820000
1998-01-01	12243350000
1999-01-01	12648200000
2000-01-01	13448160000
2001-01-01	13859370000
2002-01-01	14460640000
2003-01-01	16768640000
2004-01-01	20444480000
2005-01-01	21998520000
2006-01-01	22619450000
2007-01-01	27225370000
2008-01-01	30810080000
2009-01-01	25187970000
2010-01-01	31876620000
2011-01-01	38322200000
2012-01-01	37870320000
2013-01-01	39915160000