Quarter	US dollars
1999-03-31	657
1999-06-30	662
1999-09-30	716
1999-12-31	630
2000-03-31	481
2000-06-30	439
2000-09-30	414
2000-12-31	405
2001-03-31	375
2001-06-30	351
2001-09-30	357
2001-12-31	325
2002-03-31	288
2002-06-30	276
2002-09-30	272
2002-12-31	264
2003-03-31	257
2003-06-30	249
2003-09-30	249
2003-12-31	241
2004-03-31	285
2004-06-30	229
2004-09-30	207
2004-12-31	234
2005-03-31	258
2005-06-30	222
2005-09-30	416
2005-12-31	286
2006-03-31	610
2006-06-30	599
2006-09-30	578
2006-12-31	599
2007-03-31	618
2007-06-30	789
2007-09-30	569
2007-12-31	514
2008-03-31	469
2008-06-30	502
2008-09-30	484
2008-12-31	442
2009-03-31	469
2009-06-30	440
2009-09-30	473
2009-12-31	468
2010-03-31	430
2010-06-30	421
2010-09-30	439
2010-12-31	453
2011-03-31	442
2011-06-30	566
2011-09-30	543
2011-12-31	420
2012-03-31	383
2012-06-30	371
2012-09-30	424
2012-12-31	413
2013-03-31	391
2013-06-30	383
2013-09-30	450
2013-12-31	496
2014-03-31	425
2014-06-30	461
2014-09-30	416
2014-12-31	400
2015-03-31	364
2015-06-30	339
2015-09-30	293
2015-12-31	328
2016-03-31	307
2016-06-30	390
2016-09-30	301
2016-12-31	281
2017-03-31	254
2017-06-30	926
2017-09-30	1015
2017-12-31	809
2018-03-31	837
2018-06-30	687
2018-09-30	655
2018-12-31	676
2019-03-31	736
2019-06-30	627
2019-09-30	620
2019-12-31	629
2020-03-31	752
2020-06-30	751
2020-09-30	628
2020-12-31	625
2021-03-31	697
2021-06-30	622
2021-09-30	577
2021-12-31	519
2022-03-31	455
2022-06-30	455
2022-09-30	400
2022-12-31	373
2023-03-31	370
2023-06-30	351
2023-09-30	343