Quarter	US dollars
1999-09-30	5755
1999-12-31	5552
2000-03-31	5229
2000-06-30	5931
2000-09-30	5322
2000-12-31	5929
2001-03-31	6365
2001-06-30	6814
2001-09-30	6793
2001-12-31	6942
2002-03-31	6776
2002-06-30	6878
2002-09-30	8928
2002-12-31	6953
2003-03-31	11334
2003-06-30	8076
2003-09-30	9475
2003-12-31	9261
2004-03-31	12941
2004-06-30	10719
2004-09-30	13326
2004-12-31	14678
2005-03-31	17467
2005-06-30	15860
2005-09-30	24917
2005-12-31	22046
2006-03-31	22816
2006-06-30	30584
2006-09-30	34567
2006-12-31	38359
2007-03-31	40968
2007-06-30	43396
2007-09-30	58856
2007-12-31	60565
2008-03-31	63322
2008-06-30	62827
2008-09-30	58291
2008-12-31	56253
2009-03-31	45626
2009-06-30	44785
2009-09-30	51462
2009-12-31	53306
2010-03-31	65496
2010-06-30	72968
2010-09-30	81616
2010-12-31	100079
2011-03-31	111375
2011-06-30	146916
2011-09-30	150621
2011-12-31	149721
2012-03-31	152785
2012-06-30	152262
2012-09-30	143001
2012-12-31	142149
2013-03-31	167530
2013-06-30	178346
2013-09-30	185713
2013-12-31	195260
2014-03-31	218155
2014-06-30	205653
2014-09-30	195394
2014-12-31	192102
2015-03-31	187089
2015-06-30	179852
2015-09-30	165102
2015-12-31	151375
2016-03-31	142359
2016-06-30	140909
2016-09-30	139088
2016-12-31	144890
2017-03-31	146263
2017-06-30	183753
2017-09-30	184608
2017-12-31	201931
2018-03-31	194169
2018-06-30	185621
2018-09-30	181657
2018-12-31	181833
2019-03-31	189601
2019-06-30	198077
2019-09-30	188808