Quarter	US dollars
1999-03-31	25972
1999-06-30	23820
1999-09-30	25482
1999-12-31	27225
2000-03-31	27467
2000-06-30	27244
2000-09-30	27331
2000-12-31	31484
2001-03-31	34322
2001-06-30	32738
2001-09-30	33091
2001-12-31	28882
2002-03-31	30374
2002-06-30	33325
2002-09-30	31934
2002-12-31	35491
2003-03-31	34410
2003-06-30	35704
2003-09-30	34674
2003-12-31	34055
2004-03-31	35188
2004-06-30	32259
2004-09-30	36397
2004-12-31	36601
2005-03-31	34947
2005-06-30	36994
2005-09-30	40781
2005-12-31	45162
2006-03-31	58436
2006-06-30	64013
2006-09-30	72612
2006-12-31	70219
2007-03-31	72862
2007-06-30	82010
2007-09-30	88594
2007-12-31	92243
2008-03-31	87573
2008-06-30	75694
2008-09-30	73500
2008-12-31	69815
2009-03-31	66615
2009-06-30	68292
2009-09-30	70356
2009-12-31	74493
2010-03-31	71343
2010-06-30	64163
2010-09-30	70127
2010-12-31	67018
2011-03-31	69931
2011-06-30	67542
2011-09-30	59339
2011-12-31	60365
2012-03-31	52788
2012-06-30	50989
2012-09-30	51434
2012-12-31	51443
2013-03-31	44649
2013-06-30	42938
2013-09-30	46463
2013-12-31	48562
2014-03-31	54623
2014-06-30	56073
2014-09-30	52562
2014-12-31	56645
2015-03-31	50703
2015-06-30	43432
2015-09-30	50378
2015-12-31	51746
2016-03-31	51016
2016-06-30	51753
2016-09-30	55730
2016-12-31	53502
2017-03-31	51635
2017-06-30	44391
2017-09-30	43214
2017-12-31	54346
2018-03-31	66878
2018-06-30	60952
2018-09-30	60357
2018-12-31	67360
2019-03-31	63647
2019-06-30	61446
2019-09-30	65354
2019-12-31	74998
2020-03-31	77772
2020-06-30	75245
2020-09-30	87246
2020-12-31	94787
2021-03-31	108053
2021-06-30	104928
2021-09-30	117285
2021-12-31	127155
2022-03-31	144506
2022-06-30	151110
2022-09-30	155739
2022-12-31	160235
2023-03-31	174933
2023-06-30	195385
2023-09-30	197580