Quarter	US dollars
1999-03-31	77116
1999-06-30	67088
1999-09-30	75849
1999-12-31	62671
2000-03-31	61936
2000-06-30	61803
2000-09-30	61261
2000-12-31	62949
2001-03-31	67330
2001-06-30	69384
2001-09-30	73452
2001-12-31	66541
2002-03-31	64762
2002-06-30	66352
2002-09-30	81203
2002-12-31	102139
2003-03-31	99083
2003-06-30	101625
2003-09-30	103111
2003-12-31	86024
2004-03-31	113117
2004-06-30	104669
2004-09-30	121960
2004-12-31	123807
2005-03-31	153528
2005-06-30	157494
2005-09-30	138802
2005-12-31	184108
2006-03-31	171752
2006-06-30	170763
2006-09-30	178886
2006-12-31	190049
2007-03-31	255786
2007-06-30	261048
2007-09-30	290728
2007-12-31	296464
2008-03-31	345805
2008-06-30	282515
2008-09-30	231434
2008-12-31	244716
2009-03-31	214484
2009-06-30	214224
2009-09-30	234404
2009-12-31	250325
2010-03-31	260206
2010-06-30	242891
2010-09-30	288688
2010-12-31	259186
2011-03-31	261180
2011-06-30	263086
2011-09-30	271719
2011-12-31	268922
2012-03-31	281546
2012-06-30	262094
2012-09-30	247589
2012-12-31	266792
2013-03-31	242962
2013-06-30	229216
2013-09-30	239584
2013-12-31	213235
2014-03-31	247822
2014-06-30	235799
2014-09-30	210894
2014-12-31	205597
2015-03-31	213363
2015-06-30	208903
2015-09-30	211870
2015-12-31	200706
2016-03-31	211537
2016-06-30	194636
2016-09-30	199479
2016-12-31	186913
2017-03-31	217959
2017-06-30	205273
2017-09-30	207227
2017-12-31	181455
2018-03-31	202230
2018-06-30	183967
2018-09-30	197643
2018-12-31	192348
2019-03-31	243404
2019-06-30	252517
2019-09-30	258508
2019-12-31	217926
2020-03-31	240760
2020-06-30	217781
2020-09-30	247765
2020-12-31	287500
2021-03-31	260661
2021-06-30	242070
2021-09-30	234151
2021-12-31	222834
2022-03-31	250812
2022-06-30	214106
2022-09-30	210399
2022-12-31	204519
2023-03-31	219298
2023-06-30	220693
2023-09-30	217880