Quarter	US dollars
1999-03-31	522
1999-06-30	434
1999-09-30	456
1999-12-31	438
2000-03-31	448
2000-06-30	435
2000-09-30	420
2000-12-31	381
2001-03-31	388
2001-06-30	377
2001-09-30	413
2001-12-31	391
2002-03-31	328
2002-06-30	336
2002-09-30	315
2002-12-31	309
2003-03-31	259
2003-06-30	286
2003-09-30	276
2003-12-31	366
2004-03-31	389
2004-06-30	445
2004-09-30	457
2004-12-31	491
2005-03-31	449
2005-06-30	532
2005-09-30	445
2005-12-31	455
2006-03-31	595
2006-06-30	988
2006-09-30	444
2006-12-31	855
2007-03-31	808
2007-06-30	668
2007-09-30	1012
2007-12-31	713
2008-03-31	1039
2008-06-30	1030
2008-09-30	1000
2008-12-31	1419
2009-03-31	1386
2009-06-30	1400
2009-09-30	1579
2009-12-31	1607
2010-03-31	1599
2010-06-30	1526
2010-09-30	1669
2010-12-31	1590
2011-03-31	1720
2011-06-30	1615
2011-09-30	1169
2011-12-31	1060
2012-03-31	1025
2012-06-30	1067
2012-09-30	1035
2012-12-31	1163
2013-03-31	1056
2013-06-30	1347
2013-09-30	972
2013-12-31	1055
2014-03-31	1288
2014-06-30	1087
2014-09-30	952
2014-12-31	654
2015-03-31	583
2015-06-30	699
2015-09-30	786
2015-12-31	808
2016-03-31	1095
2016-06-30	1053
2016-09-30	1080
2016-12-31	940
2017-03-31	678
2017-06-30	701
2017-09-30	772
2017-12-31	857
2018-03-31	865
2018-06-30	930
2018-09-30	1057
2018-12-31	1070
2019-03-31	1067
2019-06-30	990
2019-09-30	935
2019-12-31	832
2020-03-31	856
2020-06-30	728
2020-09-30	763
2020-12-31	538
2021-03-31	619
2021-06-30	680
2021-09-30	568
2021-12-31	550
2022-03-31	407
2022-06-30	358
2022-09-30	561
2022-12-31	516
2023-03-31	494
2023-06-30	462
2023-09-30	451