Quarter	US dollars
1999-03-31	3488
1999-06-30	2197
1999-09-30	2389
1999-12-31	2179
2000-03-31	2472
2000-06-30	2665
2000-09-30	2294
2000-12-31	2290
2001-03-31	2122
2001-06-30	1714
2001-09-30	1841
2001-12-31	2126
2002-03-31	2401
2002-06-30	2455
2002-09-30	2307
2002-12-31	2335
2003-03-31	2179
2003-06-30	2277
2003-09-30	1953
2003-12-31	1855
2004-03-31	1483
2004-06-30	1417
2004-09-30	1539
2004-12-31	1720
2005-03-31	1653
2005-06-30	1596
2005-09-30	1343
2005-12-31	1458
2006-03-31	1625
2006-06-30	1716
2006-09-30	1414
2006-12-31	1531
2007-03-31	2202
2007-06-30	2604
2007-09-30	2434
2007-12-31	1967
2008-03-31	1583
2008-06-30	1552
2008-09-30	1333
2008-12-31	1263
2009-03-31	1714
2009-06-30	1233
2009-09-30	2525
2009-12-31	781
2010-03-31	986
2010-06-30	878
2010-09-30	2475
2010-12-31	3212
2011-03-31	720