Quarter	US dollars
1999-03-31	355642
1999-06-30	365128
1999-09-30	361156
1999-12-31	362183
2000-03-31	367186
2000-06-30	361185
2000-09-30	363723
2000-12-31	394612
2001-03-31	391643
2001-06-30	378614
2001-09-30	386306
2001-12-31	418752
2002-03-31	397544
2002-06-30	403024
2002-09-30	417272
2002-12-31	445297
2003-03-31	453275
2003-06-30	487567
2003-09-30	502818
2003-12-31	551588
2004-03-31	596588
2004-06-30	583760
2004-09-30	635333
2004-12-31	709303
2005-03-31	703484
2005-06-30	739051
2005-09-30	697482
2005-12-31	749936
2006-03-31	806033
2006-06-30	855698
2006-09-30	845686
2006-12-31	931935
2007-03-31	1023974
2007-06-30	1075358
2007-09-30	1218461
2007-12-31	1289069
2008-03-31	1385905
2008-06-30	1268605
2008-09-30	1238166
2008-12-31	1104608
2009-03-31	1037624
2009-06-30	1006019
2009-09-30	906895
2009-12-31	896670
2010-03-31	843740
2010-06-30	794927
2010-09-30	861881
2010-12-31	847106
2011-03-31	805635
2011-06-30	802739
2011-09-30	989880
2011-12-31	964977
2012-03-31	926802
2012-06-30	725684
2012-09-30	725444
2012-12-31	710903
2013-03-31	683703
2013-06-30	685500
2013-09-30	691086
2013-12-31	699900
2014-03-31	671586
2014-06-30	713257
2014-09-30	715460
2014-12-31	722400
2015-03-31	715203
2015-06-30	675461
2015-09-30	664975
2015-12-31	642473
2016-03-31	643496
2016-06-30	643489
2016-09-30	684372
2016-12-31	675292
2017-03-31	636623
2017-06-30	603462
2017-09-30	693788
2017-12-31	731083
2018-03-31	703856
2018-06-30	661898
2018-09-30	604733
2018-12-31	631436
2019-03-31	592908
2019-06-30	601544
2019-09-30	574719
2019-12-31	652920
2020-03-31	626015
2020-06-30	589608
2020-09-30	592251
2020-12-31	610460
2021-03-31	613816
2021-06-30	657778
2021-09-30	669717
2021-12-31	716873
2022-03-31	744645
2022-06-30	757019
2022-09-30	747332
2022-12-31	695819
2023-03-31	691938
2023-06-30	700743
2023-09-30	681297