Quarter	US dollars
1999-03-31	115
1999-06-30	162
1999-09-30	166
1999-12-31	99
2000-03-31	84
2000-06-30	175
2000-09-30	67
2000-12-31	82
2001-03-31	13
2001-06-30	21
2001-09-30	48
2001-12-31	64
2002-03-31	67
2002-06-30	53
2002-09-30	77
2002-12-31	83
2003-03-31	47
2003-06-30	48
2003-09-30	85
2003-12-31	91
2004-03-31	72
2004-06-30	72
2004-09-30	80
2004-12-31	63
2005-03-31	90
2005-06-30	67
2005-09-30	98
2005-12-31	165
2006-03-31	186
2006-06-30	145
2006-09-30	255
2006-12-31	253
2007-03-31	205
2007-06-30	446
2007-09-30	375
2007-12-31	411
2008-03-31	389
2008-06-30	279
2008-09-30	338
2008-12-31	259
2009-03-31	190
2009-06-30	171
2009-09-30	207
2009-12-31	244
2010-03-31	307
2010-06-30	303
2010-09-30	277
2010-12-31	320
2011-03-31	345
2011-06-30	295
2011-09-30	344
2011-12-31	342
2012-03-31	246
2012-06-30	288
2012-09-30	228
2012-12-31	295
2013-03-31	257
2013-06-30	408
2013-09-30	1107
2013-12-31	831
2014-03-31	1268
2014-06-30	1178
2014-09-30	1144
2014-12-31	940
2015-03-31	1064
2015-06-30	1213
2015-09-30	1044
2015-12-31	958
2016-03-31	659
2016-06-30	650
2016-09-30	627
2016-12-31	283
2017-03-31	862
2017-06-30	883
2017-09-30	703
2017-12-31	798
2018-03-31	1142
2018-06-30	728
2018-09-30	718
2018-12-31	1162
2019-03-31	1608
2019-06-30	1484
2019-09-30	1679
2019-12-31	1590
2020-03-31	1671
2020-06-30	1510
2020-09-30	1789
2020-12-31	1913
2021-03-31	2012
2021-06-30	2482
2021-09-30	2509
2021-12-31	2510
2022-03-31	3294
2022-06-30	2182
2022-09-30	2587
2022-12-31	2279
2023-03-31	1732
2023-06-30	988
2023-09-30	642