Quarter	US dollars
1999-03-31	230164
1999-06-30	233882
1999-09-30	246116
1999-12-31	240987
2000-03-31	262159
2000-06-30	254520
2000-09-30	271064
2000-12-31	287513
2001-03-31	290552
2001-06-30	289932
2001-09-30	318037
2001-12-31	309017
2002-03-31	304287
2002-06-30	342949
2002-09-30	351944
2002-12-31	358334
2003-03-31	398797
2003-06-30	425592
2003-09-30	413464
2003-12-31	417551
2004-03-31	476379
2004-06-30	461862
2004-09-30	470553
2004-12-31	488987
2005-03-31	489019
2005-06-30	507697
2005-09-30	517490
2005-12-31	508411
2006-03-31	547986
2006-06-30	575892
2006-09-30	605939
2006-12-31	698282
2007-03-31	787104
2007-06-30	831073
2007-09-30	930949
2007-12-31	930455
2008-03-31	1038744
2008-06-30	989929
2008-09-30	892144
2008-12-31	877316
2009-03-31	859702
2009-06-30	885102
2009-09-30	921387
2009-12-31	822784
2010-03-31	804153
2010-06-30	762289
2010-09-30	870797
2010-12-31	870537
2011-03-31	935706
2011-06-30	980635
2011-09-30	972148
2011-12-31	909920
2012-03-31	955474
2012-06-30	952513
2012-09-30	926117
2012-12-31	927930
2013-03-31	895961
2013-06-30	861075
2013-09-30	814857
2013-12-31	806184
2014-03-31	815486
2014-06-30	829162
2014-09-30	788956
2014-12-31	783694
2015-03-31	797942
2015-06-30	749375
2015-09-30	755233
2015-12-31	725632
2016-03-31	779493
2016-06-30	729018
2016-09-30	725787
2016-12-31	638172
2017-03-31	675115
2017-06-30	692539
2017-09-30	700039
2017-12-31	663524
2018-03-31	735465
2018-06-30	664862
2018-09-30	670585
2018-12-31	659364
2019-03-31	649236
2019-06-30	675032
2019-09-30	691882
2019-12-31	672778
2020-03-31	724369
2020-06-30	715528
2020-09-30	703027
2020-12-31	688651
2021-03-31	641360
2021-06-30	615064
2021-09-30	603695
2021-12-31	608486
2022-03-31	586049
2022-06-30	557659
2022-09-30	526240
2022-12-31	531108
2023-03-31	516207
2023-06-30	510395
2023-09-30	521962