Quarter	US dollars
1999-09-30	11500
1999-12-31	8420
2000-03-31	9500
2000-06-30	10250
2000-09-30	8828
2000-12-31	9522
2001-03-31	9466
2001-06-30	10112
2001-09-30	9863
2001-12-31	10702
2002-03-31	12090
2002-06-30	13524
2002-09-30	14717
2002-12-31	16267
2003-03-31	17691
2003-06-30	19609
2003-09-30	18864
2003-12-31	21447
2004-03-31	20754
2004-06-30	22680
2004-09-30	25358
2004-12-31	26931
2005-03-31	30026
2005-06-30	32059
2005-09-30	31869
2005-12-31	31064
2006-03-31	31062
2006-06-30	30532
2006-09-30	31187
2006-12-31	32433
2007-03-31	30732
2007-06-30	42691
2007-09-30	35867
2007-12-31	40077
2008-03-31	40582
2008-06-30	26069
2008-09-30	58972
2008-12-31	50172
2009-03-31	33883
2009-06-30	26747
2009-09-30	22150
2009-12-31	19126
2010-03-31	26267
2010-06-30	25854
2010-09-30	24779
2010-12-31	28698
2011-03-31	28846
2011-06-30	23397
2011-09-30	29139
2011-12-31	28386
2012-03-31	27021
2012-06-30	27814
2012-09-30	27642
2012-12-31	29095
2013-03-31	25683
2013-06-30	24685
2013-09-30	25186
2013-12-31	24125
2014-03-31	25752
2014-06-30	27413
2014-09-30	26950
2014-12-31	26501
2015-03-31	28155
2015-06-30	26605
2015-09-30	26985
2015-12-31	25393
2016-03-31	25485
2016-06-30	25125
2016-09-30	25550
2016-12-31	21962
2017-03-31	19952
2017-06-30	22019
2017-09-30	24877
2017-12-31	25642
2018-03-31	26721
2018-06-30	24867
2018-09-30	20711
2018-12-31	20787
2019-03-31	19201
2019-06-30	21652
2019-09-30	23930
2019-12-31	25593
2020-03-31	22230
2020-06-30	29751
2020-09-30	34552
2020-12-31	36450
2021-03-31	34166
2021-06-30	27187
2021-09-30	27774
2021-12-31	35483
2022-03-31	30964
2022-06-30	26467
2022-09-30	20672
2022-12-31	22597
2023-03-31	24548
2023-06-30	22541
2023-09-30	21705
2023-12-31	23578