Quarter	US dollars
1999-09-30	6873
1999-12-31	6490
2000-03-31	7118
2000-06-30	6703
2000-09-30	7319
2000-12-31	6798
2001-03-31	6531
2001-06-30	6698
2001-09-30	6865
2001-12-31	6923
2002-03-31	8270
2002-06-30	10409
2002-09-30	10563
2002-12-31	10942
2003-03-31	9654
2003-06-30	10299
2003-09-30	9736
2003-12-31	9944
2004-03-31	12106
2004-06-30	11341
2004-09-30	14162
2004-12-31	15125
2005-03-31	20375
2005-06-30	59918
2005-09-30	65467
2005-12-31	67662
2006-03-31	73600
2006-06-30	75441
2006-09-30	76564
2006-12-31	75523
2007-03-31	78931
2007-06-30	81107
2007-09-30	85887
2007-12-31	91380
2008-03-31	104185
2008-06-30	96621
2008-09-30	91315
2008-12-31	74246
2009-03-31	74289
2009-06-30	78131
2009-09-30	81732
2009-12-31	84743
2010-03-31	92447
2010-06-30	91967
2010-09-30	100044
2010-12-31	91060
2011-03-31	97587
2011-06-30	100291
2011-09-30	92577
2011-12-31	90286
2012-03-31	94842
2012-06-30	89849
2012-09-30	87415
2012-12-31	87946
2013-03-31	83095
2013-06-30	75603
2013-09-30	77796
2013-12-31	72725
2014-03-31	71812
2014-06-30	76624
2014-09-30	78004
2014-12-31	72385
2015-03-31	69880
2015-06-30	68017
2015-09-30	63440
2015-12-31	59704
2016-03-31	60884
2016-06-30	59348
2016-09-30	63613
2016-12-31	57395
2017-03-31	68440
2017-06-30	72072
2017-09-30	69854
2017-12-31	76045
2018-03-31	76784
2018-06-30	73120
2018-09-30	74836
2018-12-31	76516
2019-03-31	74960
2019-06-30	78067
2019-09-30	77206
2019-12-31	80490
2020-03-31	84806
2020-06-30	84078
2020-09-30	84292
2020-12-31	95015
2021-03-31	93929
2021-06-30	97504
2021-09-30	94610
2021-12-31	97326
2022-03-31	96907
2022-06-30	90660
2022-09-30	83916
2022-12-31	96218
2023-03-31	94964
2023-06-30	91650
2023-09-30	84026