Quarter	US dollars
1999-03-31	55946
1999-06-30	55940
1999-09-30	60083
1999-12-31	56381
2000-03-31	63509
2000-06-30	67727
2000-09-30	64144
2000-12-31	65421
2001-03-31	84036
2001-06-30	78623
2001-09-30	92244
2001-12-31	93179
2002-03-31	85206
2002-06-30	91305
2002-09-30	99255
2002-12-31	121595
2003-03-31	133141
2003-06-30	141489
2003-09-30	129701
2003-12-31	138136
2004-03-31	159544
2004-06-30	152278
2004-09-30	158452
2004-12-31	181771
2005-03-31	190538
2005-06-30	190200
2005-09-30	219387
2005-12-31	200343
2006-03-31	270946
2006-06-30	272293
2006-09-30	289011
2006-12-31	320346
2007-03-31	352766
2007-06-30	343273
2007-09-30	350597
2007-12-31	426253
2008-03-31	410273
2008-06-30	377253
2008-09-30	319755
2008-12-31	327793
2009-03-31	289897
2009-06-30	268903
2009-09-30	294620
2009-12-31	261951
2010-03-31	194463
2010-06-30	169741
2010-09-30	183557
2010-12-31	127146
2011-03-31	251007
2011-06-30	233334
2011-09-30	221177
2011-12-31	181369
2012-03-31	174313
2012-06-30	142973
2012-09-30	130382
2012-12-31	141375
2013-03-31	118392
2013-06-30	113172
2013-09-30	117195
2013-12-31	123739
2014-03-31	132076
2014-06-30	134788
2014-09-30	128634
2014-12-31	134535
2015-03-31	129813
2015-06-30	121149
2015-09-30	132187
2015-12-31	116316
2016-03-31	111584
2016-06-30	105993
2016-09-30	103591
2016-12-31	83230
2017-03-31	83570
2017-06-30	106545
2017-09-30	133070
2017-12-31	147366
2018-03-31	158690
2018-06-30	145350
2018-09-30	128276
2018-12-31	119984
2019-03-31	117534
2019-06-30	123591
2019-09-30	111403
2019-12-31	101021
2020-03-31	93964
2020-06-30	98117
2020-09-30	99829
2020-12-31	90571
2021-03-31	85877
2021-06-30	83658
2021-09-30	82928
2021-12-31	80325
2022-03-31	69800
2022-06-30	63768
2022-09-30	61543
2022-12-31	63425
2023-03-31	62880
2023-06-30	59938
2023-09-30	58552