Quarter	US dollars
1999-03-31	600
1999-06-30	505
1999-09-30	434
1999-12-31	484
2000-03-31	505
2000-06-30	416
2000-09-30	559
2000-12-31	710
2001-03-31	724
2001-06-30	807
2001-09-30	847
2001-12-31	632
2002-03-31	1157
2002-06-30	731
2002-09-30	532
2002-12-31	566
2003-03-31	618
2003-06-30	738
2003-09-30	553
2003-12-31	957
2004-03-31	795
2004-06-30	908
2004-09-30	815
2004-12-31	761
2005-03-31	618
2005-06-30	738
2005-09-30	975
2005-12-31	1605
2006-03-31	2635
2006-06-30	1342
2006-09-30	3827
2006-12-31	1474
2007-03-31	2234
2007-06-30	1972
2007-09-30	3562
2007-12-31	3157
2008-03-31	2110
2008-06-30	4051
2008-09-30	2097
2008-12-31	1910
2009-03-31	4346
2009-06-30	2412
2009-09-30	2841
2009-12-31	2509
2010-03-31	3191
2010-06-30	2743
2010-09-30	2984
2010-12-31	3087
2011-03-31	4064
2011-06-30	3196
2011-09-30	3092
2011-12-31	3293
2012-03-31	5106
2012-06-30	3834
2012-09-30	5832
2012-12-31	4104
2013-03-31	5862
2013-06-30	4390
2013-09-30	4571
2013-12-31	4483
2014-03-31	4795
2014-06-30	4930
2014-09-30	6695
2014-12-31	6937
2015-03-31	9262
2015-06-30	9711
2015-09-30	7421
2015-12-31	8299
2016-03-31	5500
2016-06-30	7976
2016-09-30	9309
2016-12-31	6828
2017-03-31	8388
2017-06-30	8525
2017-09-30	6113
2017-12-31	4732
2018-03-31	6920
2018-06-30	5046
2018-09-30	5624
2018-12-31	3835
2019-03-31	8936
2019-06-30	9091
2019-09-30	6824
2019-12-31	5921
2020-03-31	6736
2020-06-30	4571
2020-09-30	4928
2020-12-31	4361
2021-03-31	5868
2021-06-30	6012
2021-09-30	4930
2021-12-31	4044
2022-03-31	2727
2022-06-30	2057
2022-09-30	1946
2022-12-31	1988
2023-03-31	1923
2023-06-30	1862
2023-09-30	1581