Quarter	US dollars
1999-03-31	1887
1999-06-30	1560
1999-09-30	1297
1999-12-31	1374
2000-03-31	1348
2000-06-30	1394
2000-09-30	1465
2000-12-31	1214
2001-03-31	1254
2001-06-30	1439
2001-09-30	1204
2001-12-31	1297
2002-03-31	1913
2002-06-30	2361
2002-09-30	1383
2002-12-31	1016
2003-03-31	3757
2003-06-30	2295
2003-09-30	2612
2003-12-31	1404
2004-03-31	3948
2004-06-30	1497
2004-09-30	2980
2004-12-31	2700
2005-03-31	3268
2005-06-30	3383
2005-09-30	2795
2005-12-31	2299
2006-03-31	1383
2006-06-30	1748
2006-09-30	3554
2006-12-31	2646
2007-03-31	3075
2007-06-30	4218
2007-09-30	5364
2007-12-31	6108
2008-03-31	5393
2008-06-30	4390
2008-09-30	6612
2008-12-31	4337
2009-03-31	2184
2009-06-30	2070
2009-09-30	1635
2009-12-31	2272
2010-03-31	2675
2010-06-30	2538
2010-09-30	3642
2010-12-31	3072
2011-03-31	4578
2011-06-30	6814
2011-09-30	7718
2011-12-31	8234
2012-03-31	8607
2012-06-30	10428
2012-09-30	9446
2012-12-31	8119
2013-03-31	10891
2013-06-30	10807
2013-09-30	11964
2013-12-31	13094
2014-03-31	15895
2014-06-30	13824
2014-09-30	14268
2014-12-31	13407
2015-03-31	12645
2015-06-30	10487
2015-09-30	10330
2015-12-31	8629
2016-03-31	7817
2016-06-30	8663
2016-09-30	7707
2016-12-31	7167
2017-03-31	6736
2017-06-30	13145
2017-09-30	13069
2017-12-31	13523
2018-03-31	14518
2018-06-30	9791
2018-09-30	10335
2018-12-31	9867
2019-03-31	10320
2019-06-30	11252
2019-09-30	9704
2019-12-31	9976
2020-03-31	11200
2020-06-30	9658
2020-09-30	12924
2020-12-31	11921
2021-03-31	12594
2021-06-30	12043
2021-09-30	12777
2021-12-31	11288
2022-03-31	10614
2022-06-30	10011
2022-09-30	9684
2022-12-31	11499
2023-03-31	11832
2023-06-30	11452
2023-09-30	9823