Quarter	US dollars
1999-09-30	13203
1999-12-31	12815
2000-03-31	13505
2000-06-30	13613
2000-09-30	12832
2000-12-31	13616
2001-03-31	13179
2001-06-30	12738
2001-09-30	12762
2001-12-31	13539
2002-03-31	13931
2002-06-30	13955
2002-09-30	13559
2002-12-31	13929
2003-03-31	14629
2003-06-30	15449
2003-09-30	16285
2003-12-31	16915
2004-03-31	19110
2004-06-30	18083
2004-09-30	19330
2004-12-31	21280
2005-03-31	23420
2005-06-30	23369
2005-09-30	24441
2005-12-31	22235
2006-03-31	23114
2006-06-30	24562
2006-09-30	24210
2006-12-31	24367
2007-03-31	26440
2007-06-30	29161
2007-09-30	26718
2007-12-31	29073
2008-03-31	32653
2008-06-30	33038
2008-09-30	29948
2008-12-31	28191
2009-03-31	27077
2009-06-30	28183
2009-09-30	28651
2009-12-31	29662
2010-03-31	31826
2010-06-30	31622
2010-09-30	36314
2010-12-31	37946
2011-03-31	41450
2011-06-30	44538
2011-09-30	40867
2011-12-31	44432
2012-03-31	44183
2012-06-30	44059
2012-09-30	45319
2012-12-31	48911
2013-03-31	48804
2013-06-30	50985
2013-09-30	50477
2013-12-31	50505
2014-03-31	52330
2014-06-30	52936
2014-09-30	52618
2014-12-31	48670
2015-03-31	46225
2015-06-30	40899
2015-09-30	35576
2015-12-31	34405
2016-03-31	38841
2016-06-30	38090
2016-09-30	36116
2016-12-31	32791
2017-03-31	33136
2017-06-30	34548
2017-09-30	34668
2017-12-31	35185
2018-03-31	38859
2018-06-30	37622
2018-09-30	35855
2018-12-31	36678
2019-03-31	38461
2019-06-30	36935
2019-09-30	35697
2019-12-31	35829
2020-03-31	35745
2020-06-30	34325
2020-09-30	35374
2020-12-31	36665
2021-03-31	37576
2021-06-30	37914
2021-09-30	37214
2021-12-31	37618
2022-03-31	38917
2022-06-30	36828
2022-09-30	36671
2022-12-31	36442
2023-03-31	37688
2023-06-30	35017
2023-09-30	36200