Quarter	US dollars
1999-03-31	1853
1999-06-30	1837
1999-09-30	1873
1999-12-31	2995
2000-03-31	2134
2000-06-30	1908
2000-09-30	2775
2000-12-31	2558
2001-03-31	3186
2001-06-30	5061
2001-09-30	4064
2001-12-31	3333
2002-03-31	3764
2002-06-30	3577
2002-09-30	2476
2002-12-31	2651
2003-03-31	3311
2003-06-30	4335
2003-09-30	4893
2003-12-31	7782
2004-03-31	9341
2004-06-30	11393
2004-09-30	13225
2004-12-31	14117
2005-03-31	15127
2005-06-30	8959
2005-09-30	11697
2005-12-31	9045
2006-03-31	11141
2006-06-30	11024
2006-09-30	9222
2006-12-31	8590
2007-03-31	11589
2007-06-30	18215
2007-09-30	12472
2007-12-31	19185
2008-03-31	19775
2008-06-30	13641
2008-09-30	7709
2008-12-31	7101
2009-03-31	8501
2009-06-30	9930
2009-09-30	6644
2009-12-31	5431
2010-03-31	6524
2010-06-30	6184
2010-09-30	5052
2010-12-31	5712
2011-03-31	7510
2011-06-30	4593
2011-09-30	3718
2011-12-31	4167
2012-03-31	2454
2012-06-30	2855
2012-09-30	2708
2012-12-31	4765
2013-03-31	3106
2013-06-30	3206
2013-09-30	2338
2013-12-31	5014
2014-03-31	7923
2014-06-30	7834
2014-09-30	8311
2014-12-31	9033
2015-03-31	9756
2015-06-30	4816
2015-09-30	5890
2015-12-31	6471
2016-03-31	9641
2016-06-30	9569
2016-09-30	11174
2016-12-31	6911
2017-03-31	9401
2017-06-30	8724
2017-09-30	9155
2017-12-31	8525
2018-03-31	8020
2018-06-30	8228
2018-09-30	8117
2018-12-31	8604
2019-03-31	9912
2019-06-30	10960
2019-09-30	8076
2019-12-31	6943
2020-03-31	10633
2020-06-30	10104
2020-09-30	10949
2020-12-31	10469
2021-03-31	8801
2021-06-30	6039
2021-09-30	6645
2021-12-31	6947
2022-03-31	8494
2022-06-30	8788
2022-09-30	10337
2022-12-31	10534
2023-03-31	10524
2023-06-30	11108
2023-09-30	9429