Year	US Dollars, Sum Over Component Sub-periods
1991-01-01	75630000
1992-01-01	276640000
1993-01-01	548320000
1994-01-01	973110000
1995-01-01	2155300000
1996-01-01	2524750000
1997-01-01	3608600000
1998-01-01	2611770000
1999-01-01	2166970000
2000-01-01	3587990000
2001-01-01	5477640000
2002-01-01	5629670000
2003-01-01	4321080000
2004-01-01	5777810000
2005-01-01	7621770000
2006-01-01	20327760000
2007-01-01	25001130000
2008-01-01	40281180000