Quarter	US dollars
1999-03-31	14
1999-06-30	13
1999-09-30	13
1999-12-31	10
2000-03-31	10
2000-06-30	9
2000-09-30	9
2000-12-31	8
2001-03-31	20
2001-06-30	17
2001-09-30	12
2001-12-31	10
2002-03-31	16
2002-06-30	17
2002-09-30	15
2002-12-31	11
2003-03-31	6
2003-06-30	6
2003-09-30	7
2003-12-31	15
2004-03-31	109
2004-06-30	108
2004-09-30	135
2004-12-31	152
2005-03-31	135
2005-06-30	150
2005-09-30	159
2005-12-31	201
2006-03-31	316
2006-06-30	317
2006-09-30	275
2006-12-31	314
2007-03-31	282
2007-06-30	303
2007-09-30	282
2007-12-31	455
2008-03-31	651
2008-06-30	631
2008-09-30	671
2008-12-31	668
2009-03-31	596
2009-06-30	566
2009-09-30	441
2009-12-31	431
2010-03-31	1036
2010-06-30	880
2010-09-30	2099
2010-12-31	731
2011-03-31	1009
2011-06-30	1471
2011-09-30	1311
2011-12-31	1092
2012-03-31	1067
2012-06-30	852
2012-09-30	866
2012-12-31	866
2013-03-31	867
2013-06-30	847
2013-09-30	921
2013-12-31	949
2014-03-31	877
2014-06-30	1037
2014-09-30	1168
2014-12-31	1235
2015-03-31	1026
2015-06-30	1405
2015-09-30	990
2015-12-31	1555
2016-03-31	1361
2016-06-30	1391
2016-09-30	1213
2016-12-31	1094
2017-03-31	1390
2017-06-30	1244
2017-09-30	1133
2017-12-31	978
2018-03-31	979
2018-06-30	813
2018-09-30	821
2018-12-31	749
2019-03-31	808
2019-06-30	848
2019-09-30	696
2019-12-31	659
2020-03-31	569
2020-06-30	540
2020-09-30	420
2020-12-31	382
2021-03-31	395
2021-06-30	451
2021-09-30	608
2021-12-31	331
2022-03-31	399
2022-06-30	362
2022-09-30	429
2022-12-31	432
2023-03-31	769
2023-06-30	431
2023-09-30	390