Quarter	US dollars
1999-09-30	17074
1999-12-31	16321
2000-03-31	14722
2000-06-30	14435
2000-09-30	15538
2000-12-31	17100
2001-03-31	17936
2001-06-30	17041
2001-09-30	17551
2001-12-31	18491
2002-03-31	17647
2002-06-30	20883
2002-09-30	24413
2002-12-31	28313
2003-03-31	28943
2003-06-30	35246
2003-09-30	38488
2003-12-31	48689
2004-03-31	48857
2004-06-30	49325
2004-09-30	58796
2004-12-31	63236
2005-03-31	70075
2005-06-30	73932
2005-09-30	85824
2005-12-31	73570
2006-03-31	80321
2006-06-30	86550
2006-09-30	88745
2006-12-31	101140
2007-03-31	108919
2007-06-30	123024
2007-09-30	125644
2007-12-31	120872
2008-03-31	139258
2008-06-30	151741
2008-09-30	130826
2008-12-31	119519
2009-03-31	116275
2009-06-30	123670
2009-09-30	119471
2009-12-31	114141
2010-03-31	113699
2010-06-30	110844
2010-09-30	123522
2010-12-31	112098
2011-03-31	107706
2011-06-30	105734
2011-09-30	95995
2011-12-31	86300
2012-03-31	86436
2012-06-30	79792
2012-09-30	81412
2012-12-31	83019
2013-03-31	82331
2013-06-30	78885
2013-09-30	84597
2013-12-31	78103
2014-03-31	69231
2014-06-30	70368
2014-09-30	56851
2014-12-31	49577
2015-03-31	31201
2015-06-30	28169
2015-09-30	25664
2015-12-31	19428
2016-03-31	22286
2016-06-30	19980
2016-09-30	20492
2016-12-31	19990
2017-03-31	22656
2017-06-30	23818
2017-09-30	23474
2017-12-31	25114
2018-03-31	22482
2018-06-30	22596
2018-09-30	26081
2018-12-31	21675
2019-03-31	26024
2019-06-30	21579
2019-09-30	22118
2019-12-31	19157
2020-03-31	22369
2020-06-30	22156
2020-09-30	23372
2020-12-31	25021
2021-03-31	20840
2021-06-30	22742
2021-09-30	22576
2021-12-31	21497
2022-03-31	20610
2022-06-30	17862
2022-09-30	19156
2022-12-31	19397
2023-03-31	34107
2023-06-30	37171
2023-09-30	31497