Quarter	US dollars
1999-09-30	28538
1999-12-31	28575
2000-03-31	28924
2000-06-30	33133
2000-09-30	37238
2000-12-31	40799
2001-03-31	48996
2001-06-30	44236
2001-09-30	53754
2001-12-31	53303
2002-03-31	43872
2002-06-30	74240
2002-09-30	85534
2002-12-31	100113
2003-03-31	104158
2003-06-30	123974
2003-09-30	117985
2003-12-31	126152
2004-03-31	124786
2004-06-30	100365
2004-09-30	113900
2004-12-31	153016
2005-03-31	136192
2005-06-30	180634
2005-09-30	162937
2005-12-31	141795
2006-03-31	128083
2006-06-30	152471
2006-09-30	129149
2006-12-31	131166
2007-03-31	168211
2007-06-30	229608
2007-09-30	253556
2007-12-31	283094
2008-03-31	453202
2008-06-30	481507
2008-09-30	418801
2008-12-31	763307
2009-03-31	560428
2009-06-30	472898
2009-09-30	489667
2009-12-31	423299
2010-03-31	430573
2010-06-30	486793
2010-09-30	589067
2010-12-31	474483
2011-03-31	368409
2011-06-30	397592
2011-09-30	543846
2011-12-31	519681
2012-03-31	512709
2012-06-30	488951
2012-09-30	364530
2012-12-31	381274
2013-03-31	352878
2013-06-30	292300
2013-09-30	261899
2013-12-31	247378
2014-03-31	262290
2014-06-30	308462
2014-09-30	334535
2014-12-31	355820
2015-03-31	375675
2015-06-30	286167
2015-09-30	285471
2015-12-31	247003
2016-03-31	290746
2016-06-30	299234
2016-09-30	281097
2016-12-31	225697
2017-03-31	199430
2017-06-30	192465
2017-09-30	184773
2017-12-31	184398
2018-03-31	185946
2018-06-30	119900
2018-09-30	145376
2018-12-31	168119
2019-03-31	171436
2019-06-30	185629
2019-09-30	238312
2019-12-31	201850
2020-03-31	247766
2020-06-30	239944
2020-09-30	242260
2020-12-31	248260
2021-03-31	209345
2021-06-30	183678
2021-09-30	171038
2021-12-31	156778
2022-03-31	154238
2022-06-30	162889
2022-09-30	185796
2022-12-31	166261
2023-03-31	150477
2023-06-30	153628
2023-09-30	162948