Quarter	US dollars
1999-03-31	92
1999-06-30	69
1999-09-30	51
1999-12-31	82
2000-03-31	48
2000-06-30	44
2000-09-30	53
2000-12-31	47
2001-03-31	71
2001-06-30	124
2001-09-30	97
2001-12-31	134
2002-03-31	122
2002-06-30	133
2002-09-30	165
2002-12-31	200
2003-03-31	280
2003-06-30	443
2003-09-30	332
2003-12-31	260
2004-03-31	530
2004-06-30	519
2004-09-30	329
2004-12-31	385
2005-03-31	220
2005-06-30	354
2005-09-30	477
2005-12-31	504
2006-03-31	484
2006-06-30	508
2006-09-30	229
2006-12-31	816
2007-03-31	755
2007-06-30	616
2007-09-30	752
2007-12-31	978
2008-03-31	1113
2008-06-30	1468
2008-09-30	1341
2008-12-31	1085
2009-03-31	896
2009-06-30	830
2009-09-30	941
2009-12-31	958
2010-03-31	857
2010-06-30	857
2010-09-30	1157
2010-12-31	2073
2011-03-31	806
2011-06-30	917
2011-09-30	644
2011-12-31	463
2012-03-31	517
2012-06-30	340
2012-09-30	567
2012-12-31	639
2013-03-31	626
2013-06-30	738
2013-09-30	750
2013-12-31	1345
2014-03-31	995
2014-06-30	761
2014-09-30	498
2014-12-31	573
2015-03-31	548
2015-06-30	702
2015-09-30	630
2015-12-31	766
2016-03-31	674
2016-06-30	671
2016-09-30	862
2016-12-31	923
2017-03-31	913
2017-06-30	1085
2017-09-30	1205
2017-12-31	1549
2018-03-31	1532
2018-06-30	1513
2018-09-30	1601
2018-12-31	1600
2019-03-31	1823
2019-06-30	1729
2019-09-30	1637
2019-12-31	1522
2020-03-31	1685
2020-06-30	1544
2020-09-30	1674
2020-12-31	1382
2021-03-31	1504
2021-06-30	1692
2021-09-30	1397
2021-12-31	1302
2022-03-31	1584
2022-06-30	1326
2022-09-30	1227
2022-12-31	1304
2023-03-31	1517
2023-06-30	1560
2023-09-30	1331