Quarter	US dollars
1999-03-31	206089
1999-06-30	203711
1999-09-30	238781
1999-12-31	249009
2000-03-31	271716
2000-06-30	266846
2000-09-30	274182
2000-12-31	331788
2001-03-31	302796
2001-06-30	269789
2001-09-30	282130
2001-12-31	299903
2002-03-31	283447
2002-06-30	327516
2002-09-30	341855
2002-12-31	379173
2003-03-31	414576
2003-06-30	453058
2003-09-30	429545
2003-12-31	509400
2004-03-31	552074
2004-06-30	574464
2004-09-30	591953
2004-12-31	608732
2005-03-31	632840
2005-06-30	682413
2005-09-30	641095
2005-12-31	646356
2006-03-31	744551
2006-06-30	834885
2006-09-30	792058
2006-12-31	809301
2007-03-31	1031851
2007-06-30	1002118
2007-09-30	1005511
2007-12-31	1028614
2008-03-31	1025959
2008-06-30	826980
2008-09-30	746046
2008-12-31	622653
2009-03-31	594525
2009-06-30	577034
2009-09-30	602474
2009-12-31	537451
2010-03-31	547172
2010-06-30	553184
2010-09-30	619147
2010-12-31	583372
2011-03-31	483257
2011-06-30	543913
2011-09-30	523506
2011-12-31	550045
2012-03-31	571561
2012-06-30	560602
2012-09-30	572452
2012-12-31	538323
2013-03-31	522787
2013-06-30	518418
2013-09-30	515660
2013-12-31	498342
2014-03-31	480276
2014-06-30	522180
2014-09-30	511800
2014-12-31	496226
2015-03-31	454096
2015-06-30	384744
2015-09-30	377231
2015-12-31	370366
2016-03-31	343850
2016-06-30	331223
2016-09-30	359538
2016-12-31	327979
2017-03-31	323211
2017-06-30	336551
2017-09-30	328349
2017-12-31	313622
2018-03-31	309767
2018-06-30	313908
2018-09-30	286244
2018-12-31	310975
2019-03-31	310289
2019-06-30	304962
2019-09-30	317932
2019-12-31	319454
2020-03-31	325489
2020-06-30	309820
2020-09-30	330113
2020-12-31	318592
2021-03-31	338199
2021-06-30	324001
2021-09-30	343328
2021-12-31	358886
2022-03-31	371053
2022-06-30	361506
2022-09-30	345638
2022-12-31	336291
2023-03-31	350870
2023-06-30	323502
2023-09-30	324590