Quarter	US dollars
1999-03-31	632
1999-06-30	858
1999-09-30	1153
1999-12-31	1627
2000-03-31	1239
2000-06-30	864
2000-09-30	1031
2000-12-31	293
2001-03-31	217
2001-06-30	920
2001-09-30	972
2001-12-31	472
2002-03-31	871
2002-06-30	767
2002-09-30	1149
2002-12-31	898
2003-03-31	1484
2003-06-30	2674
2003-09-30	4496
2003-12-31	5538
2004-03-31	9095
2004-06-30	12075
2004-09-30	17148
2004-12-31	16700
2005-03-31	16128
2005-06-30	13707
2005-09-30	18031
2005-12-31	15170
2006-03-31	18194
2006-06-30	16981
2006-09-30	19646
2006-12-31	10017
2007-03-31	15427
2007-06-30	25409
2007-09-30	9880
2007-12-31	11668
2008-03-31	11217
2008-06-30	10900
2008-09-30	5176
2008-12-31	2765
2009-03-31	2747
2009-06-30	6151
2009-09-30	4942
2009-12-31	6346
2010-03-31	7609
2010-06-30	13657
2010-09-30	11909
2010-12-31	13250
2011-03-31	16323
2011-06-30	19060
2011-09-30	18575
2011-12-31	12231
2012-03-31	8706
2012-06-30	9428
2012-09-30	10788
2012-12-31	12789
2013-03-31	15076
2013-06-30	19896
2013-09-30	18197
2013-12-31	19639
2014-03-31	20674
2014-06-30	18534
2014-09-30	17475
2014-12-31	13629
2015-03-31	12579
2015-06-30	9126
2015-09-30	7303
2015-12-31	6135
2016-03-31	5207
2016-06-30	5836
2016-09-30	6825
2016-12-31	5452
2017-03-31	6877
2017-06-30	7886
2017-09-30	8756
2017-12-31	8233
2018-03-31	8709
2018-06-30	9034
2018-09-30	9058
2018-12-31	10136
2019-03-31	9925
2019-06-30	7932
2019-09-30	7893
2019-12-31	9588
2020-03-31	9248
2020-06-30	8100
2020-09-30	6221
2020-12-31	5604
2021-03-31	7619
2021-06-30	7006
2021-09-30	6157
2021-12-31	8175
2022-03-31	9274
2022-06-30	10457
2022-09-30	11387
2022-12-31	8201
2023-03-31	8735
2023-06-30	8748
2023-09-30	9221