Month	US dollars
1999-07-31	0
1999-08-31	526
1999-09-30	829
1999-10-31	0
1999-11-30	0
1999-12-31	5309
2000-01-31	0
2000-02-29	0
2000-03-31	4884
2000-04-30	4733
2000-05-31	5637
2000-06-30	5971
2000-07-31	7876
2000-08-31	9064
2000-09-30	9545
2000-10-31	9458
2000-11-30	10923
2000-12-31	10286
2001-01-31	9468
2001-02-28	7599
2001-03-31	7005
2001-04-30	6985
2001-05-31	7510
2001-06-30	7017
2001-07-31	7005
2001-08-31	7455
2001-09-30	7433
2001-10-31	7150
2001-11-30	7389
2001-12-31	6698
2002-01-31	5331
2002-02-28	4888
2002-03-31	4529
2002-04-30	4824
2002-05-31	5147
2002-06-30	5246
2002-07-31	5610
2002-08-31	5596
2002-09-30	5154
2002-10-31	5308
2002-11-30	5860
2002-12-31	5128
2003-01-31	4311
2003-02-28	5011
2003-03-31	5139
2003-04-30	4879
2003-05-31	4846
2003-06-30	4960
2003-07-31	5461
2003-08-31	5536
2003-09-30	6606
2003-10-31	6120
2003-11-30	5772
2003-12-31	5428
2004-01-31	5751
2004-02-29	5187
2004-03-31	5527
2004-04-30	5223
2004-05-31	5153
2004-06-30	5065
2004-07-31	5015
2004-08-31	4800
2004-09-30	4797
2004-10-31	5337
2004-11-30	5811
2004-12-31	5691
2005-01-31	5145
2005-02-28	4940
2005-03-31	4827
2005-04-30	4069
2005-05-31	3924
2005-06-30	4320
2005-07-31	4270
2005-08-31	4244
2005-09-30	4150
2005-10-31	3779
2005-11-30	3912
2005-12-31	4039
2006-01-31	4076
2006-02-28	4110
2006-03-31	3888
2006-04-30	4023
2006-05-31	4549
2006-06-30	3598
2006-07-31	3426
2006-08-31	3716
2006-09-30	3533
2006-10-31	3880
2006-11-30	4094
2006-12-31	4063
2007-01-31	4257
2007-02-28	4575
2007-03-31	4207
2007-04-30	4166
2007-05-31	4068
2007-06-30	3772
2007-07-31	4157
2007-08-31	4454
2007-09-30	4310
2007-10-31	4400
2007-11-30	4345
2007-12-31	4402
2008-01-31	4856
2008-02-29	4942
2008-03-31	7053
2008-04-30	8313
2008-05-31	8123
2008-06-30	7453
2008-07-31	7092
2008-08-31	7155
2008-09-30	7180
2008-10-31	6939
2008-11-30	6784
2008-12-31	5090
2009-01-31	2554
2009-02-28	2714
2009-03-31	1668
2009-04-30	1526
2009-05-31	1506
2009-06-30	1436
2009-07-31	1316
2009-08-31	971
2009-09-30	948
2009-10-31	1180
2009-11-30	1291
2009-12-31	1098
2010-01-31	1367
2010-02-28	3386
2010-03-31	4500
2010-04-30	3308
2010-05-31	2884
2010-06-30	2981
2010-07-31	3435
2010-08-31	3722
2010-09-30	3645
2010-10-31	4035
2010-11-30	4041
2010-12-31	4711
2011-01-31	5037
2011-02-28	5102
2011-03-31	4905
2011-04-30	5015
2011-05-31	5027
2011-06-30	5450
2011-07-31	5585
2011-08-31	6146
2011-09-30	5638
2011-10-31	6596
2011-11-30	6870
2011-12-31	6683
2012-01-31	5768
2012-02-29	5047
2012-03-31	5204
2012-04-30	5733
2012-05-31	6777
2012-06-30	7132
2012-07-31	7159
2012-08-31	6752
2012-09-30	5607
2012-10-31	6574
2012-11-30	6765
2012-12-31	6806
2013-01-31	6285
2013-02-28	6372
2013-03-31	7083
2013-04-30	5770
2013-05-31	5705
2013-06-30	5456
2013-07-31	5141
2013-08-31	5198
2013-09-30	4774
2013-10-31	4544
2013-11-30	4300
2013-12-31	4017
2014-01-31	4088
2014-02-28	3903
2014-03-31	5822
2014-04-30	3065
2014-05-31	4055
2014-06-30	3981
2014-07-31	5058
2014-08-31	4361
2014-09-30	4676
2014-10-31	4809
2014-11-30	4481
2014-12-31	4927
2015-01-31	4700
2015-02-28	6336
2015-03-31	6696
2015-04-30	7192
2015-05-31	6667
2015-06-30	4687
2015-07-31	7145
2015-08-31	6623
2015-09-30	9013
2015-10-31	8481
2015-11-30	8933
2015-12-31	9433
2016-01-31	10089
2016-02-29	8122
2016-03-31	7663
2016-04-30	15267
2016-05-31	12441
2016-06-30	8777
2016-07-31	14809
2016-08-31	15545
2016-09-30	12894
2016-10-31	15397
2016-11-30	11723
2016-12-31	11074
2017-01-31	13508
2017-02-28	11060
2017-03-31	8457
2017-04-30	15729
2017-05-31	13743
2017-06-30	5500
2017-07-31	14605
2017-08-31	13381
2017-09-30	7532
2017-10-31	11719
2017-11-30	7645
2017-12-31	10824
2018-01-31	16961
2018-02-28	14778
2018-03-31	8944
2018-04-30	13904
2018-05-31	17437
2018-06-30	12046
2018-07-31	14985
2018-08-31	18606
2018-09-30	11549
2018-10-31	14182
2018-11-30	9493
2018-12-31	9645
2019-01-31	12453
2019-02-28	9566
2019-03-31	7564
2019-04-30	18309
2019-05-31	12242
2019-06-30	14087
2019-07-31	22758
2019-08-31	20999
2019-09-30	9623
2019-10-31	14297
2019-11-30	13798
2019-12-31	9986
2020-01-31	18121