Quarter	US dollars
1999-03-31	8248
1999-06-30	7453
1999-09-30	8047
1999-12-31	6358
2000-03-31	6062
2000-06-30	6436
2000-09-30	5318
2000-12-31	5505
2001-03-31	5389
2001-06-30	4040
2001-09-30	3505
2001-12-31	3192
2002-03-31	3250
2002-06-30	3302
2002-09-30	3147
2002-12-31	3130
2003-03-31	2942
2003-06-30	3147
2003-09-30	3119
2003-12-31	3258
2004-03-31	2769
2004-06-30	2485
2004-09-30	2518
2004-12-31	2607
2005-03-31	2731
2005-06-30	575
2005-09-30	535
2005-12-31	566
2006-03-31	568
2006-06-30	514
2006-09-30	628
2006-12-31	664
2007-03-31	432
2007-06-30	420
2007-09-30	501
2007-12-31	438
2008-03-31	380
2008-06-30	381
2008-09-30	328
2008-12-31	153
2009-03-31	255
2009-06-30	220
2009-09-30	291
2009-12-31	217
2010-03-31	220
2010-06-30	201
2010-09-30	201
2010-12-31	152
2011-03-31	252