Quarter	US dollars
1999-09-30	4915
1999-12-31	5855
2000-03-31	5558
2000-06-30	5820
2000-09-30	6110
2000-12-31	5303
2001-03-31	4875
2001-06-30	5029
2001-09-30	4892
2001-12-31	5387
2002-03-31	5601
2002-06-30	6706
2002-09-30	6672
2002-12-31	7346
2003-03-31	7858
2003-06-30	8350
2003-09-30	10673
2003-12-31	11778
2004-03-31	15641
2004-06-30	11865
2004-09-30	14092
2004-12-31	12715
2005-03-31	15102
2005-06-30	11723
2005-09-30	17327
2005-12-31	12397
2006-03-31	14684
2006-06-30	14793
2006-09-30	18942
2006-12-31	14564
2007-03-31	15257
2007-06-30	21940
2007-09-30	27006
2007-12-31	28591
2008-03-31	32146
2008-06-30	31774
2008-09-30	28834
2008-12-31	26008
2009-03-31	25618
2009-06-30	26136
2009-09-30	28501
2009-12-31	31917
2010-03-31	36471
2010-06-30	41344
2010-09-30	42965
2010-12-31	46926
2011-03-31	50839
2011-06-30	53589
2011-09-30	51289
2011-12-31	48180
2012-03-31	45300
2012-06-30	44404
2012-09-30	47943
2012-12-31	50082
2013-03-31	53460
2013-06-30	54069
2013-09-30	55947
2013-12-31	57587
2014-03-31	56930
2014-06-30	55854
2014-09-30	57048
2014-12-31	53120
2015-03-31	51342
2015-06-30	49200
2015-09-30	45164
2015-12-31	41994
2016-03-31	43853
2016-06-30	43521
2016-09-30	44744
2016-12-31	43353
2017-03-31	49953
2017-06-30	49843
2017-09-30	52251
2017-12-31	53127
2018-03-31	57973
2018-06-30	55664
2018-09-30	55628
2018-12-31	56315
2019-03-31	56339
2019-06-30	54598
2019-09-30	52571
2019-12-31	53127
2020-03-31	56300
2020-06-30	52846
2020-09-30	52161
2020-12-31	56088
2021-03-31	61856
2021-06-30	60457
2021-09-30	60225
2021-12-31	62392
2022-03-31	62308
2022-06-30	58227
2022-09-30	55712
2022-12-31	51753
2023-03-31	55339
2023-06-30	54978
2023-09-30	56390