Quarter	US dollars
1999-03-31	298
1999-06-30	302
1999-09-30	339
1999-12-31	324
2000-03-31	293
2000-06-30	349
2000-09-30	439
2000-12-31	424
2001-03-31	486
2001-06-30	483
2001-09-30	592
2001-12-31	585
2002-03-31	561
2002-06-30	555
2002-09-30	606
2002-12-31	749
2003-03-31	660
2003-06-30	464
2003-09-30	597
2003-12-31	607
2004-03-31	608
2004-06-30	663
2004-09-30	836
2004-12-31	730
2005-03-31	712
2005-06-30	789
2005-09-30	815
2005-12-31	785
2006-03-31	821
2006-06-30	1155
2006-09-30	1126
2006-12-31	1066
2007-03-31	989
2007-06-30	1024
2007-09-30	1484
2007-12-31	1969
2008-03-31	1491
2008-06-30	2015
2008-09-30	2176
2008-12-31	2509
2009-03-31	2446
2009-06-30	2629
2009-09-30	1788
2009-12-31	1494
2010-03-31	1494
2010-06-30	1367
2010-09-30	1605
2010-12-31	1145
2011-03-31	1050
2011-06-30	1191
2011-09-30	1575
2011-12-31	1602
2012-03-31	1383
2012-06-30	1255
2012-09-30	1409
2012-12-31	1375
2013-03-31	1369
2013-06-30	1309
2013-09-30	1293
2013-12-31	1405
2014-03-31	1451
2014-06-30	1584
2014-09-30	1420
2014-12-31	1480
2015-03-31	1616
2015-06-30	1527
2015-09-30	1359
2015-12-31	1291
2016-03-31	1259
2016-06-30	1296
2016-09-30	1285
2016-12-31	913
2017-03-31	806
2017-06-30	825
2017-09-30	665
2017-12-31	716
2018-03-31	776
2018-06-30	756
2018-09-30	755
2018-12-31	699
2019-03-31	665
2019-06-30	605
2019-09-30	502
2019-12-31	678
2020-03-31	615
2020-06-30	655
2020-09-30	617
2020-12-31	453
2021-03-31	465
2021-06-30	543
2021-09-30	597
2021-12-31	572
2022-03-31	715
2022-06-30	773
2022-09-30	742
2022-12-31	560
2023-03-31	675
2023-06-30	762
2023-09-30	544