Quarter	US dollars
1999-03-31	1006
1999-06-30	988
1999-09-30	945
1999-12-31	998
2000-03-31	989
2000-06-30	1064
2000-09-30	946
2000-12-31	918
2001-03-31	933
2001-06-30	1040
2001-09-30	1122
2001-12-31	1184
2002-03-31	1254
2002-06-30	1364
2002-09-30	1498
2002-12-31	1497
2003-03-31	1677
2003-06-30	1777
2003-09-30	1655
2003-12-31	1689
2004-03-31	1818
2004-06-30	1819
2004-09-30	1808
2004-12-31	1900
2005-03-31	1736
2005-06-30	1625
2005-09-30	1615
2005-12-31	1648
2006-03-31	2410
2006-06-30	1925
2006-09-30	1992
2006-12-31	2890
2007-03-31	2858
2007-06-30	3600
2007-09-30	2324
2007-12-31	2266
2008-03-31	2914
2008-06-30	2397
2008-09-30	1970
2008-12-31	2319
2009-03-31	2226
2009-06-30	2088
2009-09-30	2623
2009-12-31	2574
2010-03-31	3503
2010-06-30	3751
2010-09-30	3221
2010-12-31	4782
2011-03-31	6582
2011-06-30	5415
2011-09-30	5256
2011-12-31	3357
2012-03-31	2463
2012-06-30	2837
2012-09-30	2557
2012-12-31	2542
2013-03-31	3120
2013-06-30	3450
2013-09-30	2951
2013-12-31	2860
2014-03-31	3393
2014-06-30	3024
2014-09-30	2657
2014-12-31	2396
2015-03-31	2356
2015-06-30	2427
2015-09-30	2479
2015-12-31	3005
2016-03-31	2907
2016-06-30	2718
2016-09-30	2687
2016-12-31	2479
2017-03-31	2505
2017-06-30	2293
2017-09-30	2592
2017-12-31	2696
2018-03-31	2445
2018-06-30	1993
2018-09-30	1974
2018-12-31	2186
2019-03-31	1968
2019-06-30	1750
2019-09-30	2023
2019-12-31	2286
2020-03-31	1962
2020-06-30	2398
2020-09-30	2587
2020-12-31	3770
2021-03-31	5174
2021-06-30	5465
2021-09-30	5484
2021-12-31	6454
2022-03-31	5104
2022-06-30	5139
2022-09-30	5071
2022-12-31	5509
2023-03-31	7237
2023-06-30	7192
2023-09-30	5753