Quarter	US dollars
1999-03-31	140645
1999-06-30	134333
1999-09-30	137296
1999-12-31	107507
2000-03-31	124854
2000-06-30	124773
2000-09-30	114518
2000-12-31	102875
2001-03-31	127034
2001-06-30	127333
2001-09-30	130178
2001-12-31	125118
2002-03-31	138558
2002-06-30	157165
2002-09-30	166672
2002-12-31	185421
2003-03-31	230170
2003-06-30	245350
2003-09-30	265151
2003-12-31	303321
2004-03-31	320410
2004-06-30	326653
2004-09-30	356213
2004-12-31	390925
2005-03-31	413543
2005-06-30	405773
2005-09-30	400977
2005-12-31	366317
2006-03-31	397223
2006-06-30	431753
2006-09-30	433632
2006-12-31	438670
2007-03-31	484591
2007-06-30	543170
2007-09-30	538413
2007-12-31	578575
2008-03-31	651079
2008-06-30	679640
2008-09-30	600826
2008-12-31	550773
2009-03-31	594320
2009-06-30	629359
2009-09-30	614976
2009-12-31	579592
2010-03-31	625802
2010-06-30	549934
2010-09-30	630144
2010-12-31	597731
2011-03-31	631582
2011-06-30	667568
2011-09-30	670450
2011-12-31	603133
2012-03-31	649839
2012-06-30	633709
2012-09-30	615160
2012-12-31	622542
2013-03-31	613935
2013-06-30	622178
2013-09-30	599823
2013-12-31	572901
2014-03-31	587758
2014-06-30	568811
2014-09-30	545764
2014-12-31	514067
2015-03-31	494738
2015-06-30	510846
2015-09-30	493287
2015-12-31	442325