Quarter	US dollars
1999-03-31	1434
1999-06-30	1514
1999-09-30	1607
1999-12-31	1758
2000-03-31	1730
2000-06-30	1594
2000-09-30	1871
2000-12-31	1863
2001-03-31	1941
2001-06-30	2441
2001-09-30	2692
2001-12-31	2496
2002-03-31	2352
2002-06-30	2328
2002-09-30	2288
2002-12-31	2512
2003-03-31	2381
2003-06-30	2365
2003-09-30	2444
2003-12-31	2233
2004-03-31	2268
2004-06-30	2314
2004-09-30	2492
2004-12-31	2456
2005-03-31	2567
2005-06-30	2138
2005-09-30	2408
2005-12-31	2370
2006-03-31	2477
2006-06-30	2359
2006-09-30	3288
2006-12-31	3018
2007-03-31	3335
2007-06-30	4412
2007-09-30	3611
2007-12-31	3602
2008-03-31	4050
2008-06-30	4508
2008-09-30	3106
2008-12-31	2214
2009-03-31	2354
2009-06-30	2291
2009-09-30	2419
2009-12-31	2313
2010-03-31	2222
2010-06-30	1851
2010-09-30	1804
2010-12-31	1757
2011-03-31	1552
2011-06-30	1279
2011-09-30	1410
2011-12-31	1263
2012-03-31	1305
2012-06-30	1505
2012-09-30	1568
2012-12-31	1633
2013-03-31	1865
2013-06-30	1817
2013-09-30	2221
2013-12-31	2487
2014-03-31	2579
2014-06-30	2526
2014-09-30	2719
2014-12-31	2629
2015-03-31	2659
2015-06-30	2879
2015-09-30	3455
2015-12-31	3114
2016-03-31	3148
2016-06-30	3289
2016-09-30	2974
2016-12-31	2972
2017-03-31	3416
2017-06-30	3440
2017-09-30	3734
2017-12-31	3607
2018-03-31	3832
2018-06-30	4004
2018-09-30	4100
2018-12-31	3429
2019-03-31	2930
2019-06-30	2964
2019-09-30	3267
2019-12-31	3094
2020-03-31	4381
2020-06-30	3369
2020-09-30	3541
2020-12-31	3479
2021-03-31	6267
2021-06-30	3968
2021-09-30	4271
2021-12-31	3894
2022-03-31	4039
2022-06-30	5172
2022-09-30	5228
2022-12-31	5124
2023-03-31	5212
2023-06-30	5346
2023-09-30	5133