Quarter	US dollars
1999-03-31	102934
1999-06-30	102128
1999-09-30	106636
1999-12-31	103577
2000-03-31	119386
2000-06-30	125984
2000-09-30	140979
2000-12-31	139226
2001-03-31	152502
2001-06-30	157496
2001-09-30	158080
2001-12-31	144302
2002-03-31	128203
2002-06-30	137222
2002-09-30	134352
2002-12-31	148017
2003-03-31	157036
2003-06-30	154424
2003-09-30	163759
2003-12-31	183344
2004-03-31	207828
2004-06-30	220225
2004-09-30	245579
2004-12-31	241194
2005-03-31	269126
2005-06-30	273744
2005-09-30	304146
2005-12-31	308510
2006-03-31	353064
2006-06-30	374809
2006-09-30	406983
2006-12-31	408001
2007-03-31	440773
2007-06-30	433996
2007-09-30	481416
2007-12-31	514052
2008-03-31	486810
2008-06-30	428343
2008-09-30	458357
2008-12-31	319153
2009-03-31	286401
2009-06-30	283101
2009-09-30	282884
2009-12-31	269221
2010-03-31	275612
2010-06-30	266343
2010-09-30	263095
2010-12-31	278166
2011-03-31	297729
2011-06-30	294771
2011-09-30	291961
2011-12-31	299954
2012-03-31	322333
2012-06-30	331644
2012-09-30	324993
2012-12-31	307189
2013-03-31	336047
2013-06-30	315441
2013-09-30	329372
2013-12-31	359215
2014-03-31	360194
2014-06-30	370842
2014-09-30	363586
2014-12-31	346430
2015-03-31	334029
2015-06-30	347782
2015-09-30	357609
2015-12-31	349471
2016-03-31	340211
2016-06-30	341525
2016-09-30	331263
2016-12-31	313318
2017-03-31	349655
2017-06-30	339817
2017-09-30	333337
2017-12-31	338485
2018-03-31	356114
2018-06-30	327767
2018-09-30	346301
2018-12-31	349529
2019-03-31	387594
2019-06-30	392543
2019-09-30	354506
2019-12-31	349326
2020-03-31	375409
2020-06-30	328349
2020-09-30	326031
2020-12-31	346075
2021-03-31	368218
2021-06-30	365987
2021-09-30	372383
2021-12-31	376717
2022-03-31	389869
2022-06-30	386120
2022-09-30	360580
2022-12-31	333447
2023-03-31	340220
2023-06-30	341153
2023-09-30	322677