Quarter	US dollars
1999-03-31	309
1999-06-30	344
1999-09-30	301
1999-12-31	369
2000-03-31	385
2000-06-30	380
2000-09-30	369
2000-12-31	438
2001-03-31	404
2001-06-30	376
2001-09-30	333
2001-12-31	648
2002-03-31	673
2002-06-30	755
2002-09-30	786
2002-12-31	805
2003-03-31	595
2003-06-30	586
2003-09-30	589
2003-12-31	724
2004-03-31	803
2004-06-30	816
2004-09-30	878
2004-12-31	962
2005-03-31	963
2005-06-30	1064
2005-09-30	1241
2005-12-31	1389
2006-03-31	1409
2006-06-30	1529
2006-09-30	1444
2006-12-31	1543
2007-03-31	1572
2007-06-30	1551
2007-09-30	1905
2007-12-31	1624
2008-03-31	1527
2008-06-30	1152
2008-09-30	724
2008-12-31	157
2009-03-31	115
2009-06-30	134
2009-09-30	135
2009-12-31	85
2010-03-31	122
2010-06-30	136
2010-09-30	97
2010-12-31	133
2011-03-31	196
2011-06-30	70
2011-09-30	126
2011-12-31	241
2012-03-31	11
2012-06-30	163
2012-09-30	10
2012-12-31	9
2013-03-31	11
2013-06-30	29
2013-09-30	27
2013-12-31	13
2014-03-31	45
2014-06-30	12
2014-09-30	625
2014-12-31	409
2015-03-31	14
2015-06-30	17
2015-09-30	26
2015-12-31	22
2016-03-31	23
2016-06-30	32
2016-09-30	32
2016-12-31	27
2017-03-31	61
2017-06-30	50
2017-09-30	128
2017-12-31	109
2018-03-31	191
2018-06-30	127
2018-09-30	176
2018-12-31	298
2019-03-31	216
2019-06-30	240
2019-09-30	319
2019-12-31	307
2020-03-31	237
2020-06-30	300
2020-09-30	324
2020-12-31	331
2021-03-31	349
2021-06-30	357
2021-09-30	327
2021-12-31	386
2022-03-31	515
2022-06-30	439
2022-09-30	745
2022-12-31	672
2023-03-31	347
2023-06-30	511
2023-09-30	518