Quarter	US dollars
1999-03-31	370
1999-06-30	285
1999-09-30	239
1999-12-31	211
2000-03-31	194
2000-06-30	419
2000-09-30	344
2000-12-31	376
2001-03-31	209
2001-06-30	123
2001-09-30	193
2001-12-31	84
2002-03-31	79
2002-06-30	106
2002-09-30	207
2002-12-31	49
2003-03-31	148
2003-06-30	235
2003-09-30	437
2003-12-31	1081
2004-03-31	755
2004-06-30	127
2004-09-30	147
2004-12-31	122
2005-03-31	125
2005-06-30	193
2005-09-30	241
2005-12-31	455
2006-03-31	297
2006-06-30	327
2006-09-30	348
2006-12-31	307
2007-03-31	475
2007-06-30	904
2007-09-30	868
2007-12-31	291
2008-03-31	411
2008-06-30	357
2008-09-30	655
2008-12-31	375
2009-03-31	264
2009-06-30	547
2009-09-30	589
2009-12-31	632
2010-03-31	572
2010-06-30	393
2010-09-30	443
2010-12-31	323
2011-03-31	256
2011-06-30	294
2011-09-30	299
2011-12-31	167
2012-03-31	181
2012-06-30	197
2012-09-30	107
2012-12-31	106
2013-03-31	68
2013-06-30	186
2013-09-30	343
2013-12-31	266
2014-03-31	216
2014-06-30	261
2014-09-30	282
2014-12-31	295
2015-03-31	479
2015-06-30	540
2015-09-30	275
2015-12-31	294
2016-03-31	302
2016-06-30	293
2016-09-30	114
2016-12-31	93
2017-03-31	246
2017-06-30	201
2017-09-30	363
2017-12-31	105
2018-03-31	255
2018-06-30	279
2018-09-30	266
2018-12-31	89
2019-03-31	208
2019-06-30	192
2019-09-30	160
2019-12-31	38
2020-03-31	102
2020-06-30	115
2020-09-30	215
2020-12-31	118
2021-03-31	227
2021-06-30	289
2021-09-30	227
2021-12-31	41
2022-03-31	90
2022-06-30	312
2022-09-30	122
2022-12-31	150
2023-03-31	102
2023-06-30	88
2023-09-30	71