Quarter	US dollars
1999-03-31	34757
1999-06-30	35729
1999-09-30	36531
1999-12-31	33968
2000-03-31	43217
2000-06-30	42990
2000-09-30	44888
2000-12-31	43055
2001-03-31	46100
2001-06-30	49689
2001-09-30	49372
2001-12-31	44477
2002-03-31	42330
2002-06-30	45854
2002-09-30	44355
2002-12-31	44360
2003-03-31	47997
2003-06-30	47396
2003-09-30	52478
2003-12-31	62427
2004-03-31	77868
2004-06-30	83625
2004-09-30	90266
2004-12-31	87726
2005-03-31	96173
2005-06-30	83248
2005-09-30	95882
2005-12-31	88483
2006-03-31	99717
2006-06-30	98826
2006-09-30	106379
2006-12-31	110254
2007-03-31	123763
2007-06-30	130031
2007-09-30	141686
2007-12-31	135464
2008-03-31	116888
2008-06-30	89176
2008-09-30	86258
2008-12-31	69318
2009-03-31	73444
2009-06-30	80492
2009-09-30	69734
2009-12-31	57368
2010-03-31	65881
2010-06-30	78946
2010-09-30	78573
2010-12-31	82122
2011-03-31	82144
2011-06-30	79831
2011-09-30	86353
2011-12-31	97466
2012-03-31	91318
2012-06-30	85592
2012-09-30	99799
2012-12-31	99142
2013-03-31	103522
2013-06-30	91030
2013-09-30	101886
2013-12-31	119102
2014-03-31	121783
2014-06-30	144067
2014-09-30	144626
2014-12-31	138779
2015-03-31	136189
2015-06-30	137905
2015-09-30	140221
2015-12-31	140389
2016-03-31	155269
2016-06-30	145387
2016-09-30	151365
2016-12-31	127817
2017-03-31	146171
2017-06-30	145977
2017-09-30	147160
2017-12-31	148976
2018-03-31	147617
2018-06-30	128818
2018-09-30	143599
2018-12-31	144763
2019-03-31	178401
2019-06-30	173384
2019-09-30	157888
2019-12-31	144328
2020-03-31	181792
2020-06-30	154111
2020-09-30	161559
2020-12-31	173783
2021-03-31	209944
2021-06-30	211232
2021-09-30	217923
2021-12-31	221819
2022-03-31	236952
2022-06-30	222431
2022-09-30	191014
2022-12-31	175680
2023-03-31	165322
2023-06-30	149335
2023-09-30	158411