Quarter	US dollars
1999-03-31	3287
1999-06-30	3303
1999-09-30	4578
1999-12-31	3618
2000-03-31	7456
2000-06-30	8346
2000-09-30	7319
2000-12-31	8452
2001-03-31	8038
2001-06-30	10077
2001-09-30	10146
2001-12-31	7381
2002-03-31	5693
2002-06-30	8179
2002-09-30	9069
2002-12-31	9451
2003-03-31	8647
2003-06-30	6473
2003-09-30	7794
2003-12-31	7561
2004-03-31	10869
2004-06-30	13236
2004-09-30	13926
2004-12-31	11798
2005-03-31	14117
2005-06-30	9605
2005-09-30	14756
2005-12-31	13177
2006-03-31	14431
2006-06-30	12715
2006-09-30	16597
2006-12-31	16756
2007-03-31	20529
2007-06-30	14725
2007-09-30	40002
2007-12-31	30488
2008-03-31	30861
2008-06-30	15784
2008-09-30	18036
2008-12-31	11298
2009-03-31	15072
2009-06-30	13054
2009-09-30	13300
2009-12-31	10023
2010-03-31	11793
2010-06-30	20064
2010-09-30	25907
2010-12-31	29420
2011-03-31	20991
2011-06-30	26961
2011-09-30	28223
2011-12-31	30394
2012-03-31	39326
2012-06-30	34542
2012-09-30	50022
2012-12-31	46736
2013-03-31	48239
2013-06-30	44377
2013-09-30	48402
2013-12-31	58945
2014-03-31	60652
2014-06-30	74846
2014-09-30	71265
2014-12-31	70582
2015-03-31	69431
2015-06-30	71837
2015-09-30	68020
2015-12-31	71334
2016-03-31	79875
2016-06-30	71512
2016-09-30	67900
2016-12-31	60944
2017-03-31	67238
2017-06-30	68101
2017-09-30	67153
2017-12-31	72782
2018-03-31	68190
2018-06-30	56350
2018-09-30	67972
2018-12-31	65497
2019-03-31	92890
2019-06-30	84245
2019-09-30	69894
2019-12-31	60188
2020-03-31	84475
2020-06-30	66958
2020-09-30	75805
2020-12-31	87698
2021-03-31	109836
2021-06-30	111164
2021-09-30	111415
2021-12-31	115887
2022-03-31	119375
2022-06-30	112569
2022-09-30	78453
2022-12-31	66495
2023-03-31	62339
2023-06-30	52560
2023-09-30	57465