Quarter	US dollars
1999-03-31	959
1999-06-30	596
1999-09-30	149
1999-12-31	83
2000-03-31	108
2000-06-30	130
2000-09-30	143
2000-12-31	250
2001-03-31	563
2001-06-30	803
2001-09-30	825
2001-12-31	927
2002-03-31	847
2002-06-30	449
2002-09-30	494
2002-12-31	819
2003-03-31	785
2003-06-30	713
2003-09-30	658
2003-12-31	789
2004-03-31	809
2004-06-30	565
2004-09-30	633
2004-12-31	655
2005-03-31	661
2005-06-30	699
2005-09-30	805
2005-12-31	654
2006-03-31	1283
2006-06-30	1929
2006-09-30	1459
2006-12-31	2609
2007-03-31	1977
2007-06-30	2928
2007-09-30	3150
2007-12-31	3707
2008-03-31	3724
2008-06-30	4068
2008-09-30	3671
2008-12-31	2113
2009-03-31	2989
2009-06-30	2960
2009-09-30	3521
2009-12-31	3692
2010-03-31	3505
2010-06-30	3522
2010-09-30	3693
2010-12-31	3787
2011-03-31	2919
2011-06-30	2592
2011-09-30	1716
2011-12-31	1616
2012-03-31	1863
2012-06-30	1174
2012-09-30	1323
2012-12-31	1662
2013-03-31	1557
2013-06-30	1821
2013-09-30	2110
2013-12-31	1839
2014-03-31	1187
2014-06-30	1652
2014-09-30	2206
2014-12-31	3753
2015-03-31	2524
2015-06-30	1911
2015-09-30	2336
2015-12-31	2282
2016-03-31	2160
2016-06-30	2621
2016-09-30	1852
2016-12-31	2035
2017-03-31	1199
2017-06-30	1643
2017-09-30	1064
2017-12-31	832
2018-03-31	1230
2018-06-30	889
2018-09-30	923
2018-12-31	1491
2019-03-31	1149
2019-06-30	1032
2019-09-30	1167
2019-12-31	1773
2020-03-31	1291
2020-06-30	1346
2020-09-30	1320
2020-12-31	954
2021-03-31	843
2021-06-30	547
2021-09-30	622
2021-12-31	321
2022-03-31	698
2022-06-30	830
2022-09-30	792
2022-12-31	701
2023-03-31	588
2023-06-30	571
2023-09-30	439