Quarter	US dollars
1999-03-31	1268
1999-06-30	1315
1999-09-30	1341
1999-12-31	1220
2000-03-31	1175
2000-06-30	1189
2000-09-30	1344
2000-12-31	1196
2001-03-31	1131
2001-06-30	1175
2001-09-30	1233
2001-12-31	1262
2002-03-31	1205
2002-06-30	1327
2002-09-30	1420
2002-12-31	1391
2003-03-31	1387
2003-06-30	1491
2003-09-30	1536
2003-12-31	1631
2004-03-31	2232
2004-06-30	1784
2004-09-30	2294
2004-12-31	1972
2005-03-31	1853
2005-06-30	2272
2005-09-30	2435
2005-12-31	2567
2006-03-31	2098
2006-06-30	3285
2006-09-30	2946
2006-12-31	3446
2007-03-31	2851
2007-06-30	3342
2007-09-30	3197
2007-12-31	3363
2008-03-31	3901
2008-06-30	3897
2008-09-30	5189
2008-12-31	3478
2009-03-31	3725
2009-06-30	3778
2009-09-30	3432
2009-12-31	3934
2010-03-31	4365
2010-06-30	4330
2010-09-30	5447
2010-12-31	4781
2011-03-31	6582
2011-06-30	4171
2011-09-30	4664
2011-12-31	4481
2012-03-31	3510
2012-06-30	4286
2012-09-30	4157
2012-12-31	4471
2013-03-31	4604
2013-06-30	5648
2013-09-30	5699
2013-12-31	6182
2014-03-31	6378
2014-06-30	6183
2014-09-30	6528
2014-12-31	7840
2015-03-31	6339
2015-06-30	6473
2015-09-30	6488
2015-12-31	7158
2016-03-31	6541
2016-06-30	6735
2016-09-30	6396
2016-12-31	5545
2017-03-31	5619
2017-06-30	5761
2017-09-30	6527
2017-12-31	6532
2018-03-31	6487
2018-06-30	6048
2018-09-30	6402
2018-12-31	6618
2019-03-31	5037
2019-06-30	4662
2019-09-30	4458
2019-12-31	4451
2020-03-31	4676
2020-06-30	4824
2020-09-30	5248
2020-12-31	5982
2021-03-31	6561
2021-06-30	7320
2021-09-30	6264
2021-12-31	6208
2022-03-31	6321
2022-06-30	4652
2022-09-30	4420
2022-12-31	4169
2023-03-31	6750
2023-06-30	6550
2023-09-30	6379