Quarter	US dollars
1999-03-31	38575
1999-06-30	31610
1999-09-30	40705
1999-12-31	38093
2000-03-31	43995
2000-06-30	37752
2000-09-30	29704
2000-12-31	29901
2001-03-31	39227
2001-06-30	37843
2001-09-30	45120
2001-12-31	38026
2002-03-31	41456
2002-06-30	46579
2002-09-30	46077
2002-12-31	38189
2003-03-31	40775
2003-06-30	38374
2003-09-30	43530
2003-12-31	47342
2004-03-31	68416
2004-06-30	56060
2004-09-30	53024
2004-12-31	57352
2005-03-31	74399
2005-06-30	67360
2005-09-30	68371
2005-12-31	63687
2006-03-31	67651
2006-06-30	71112
2006-09-30	72776
2006-12-31	79164
2007-03-31	99051
2007-06-30	115997
2007-09-30	118564
2007-12-31	128386
2008-03-31	119668
2008-06-30	113494
2008-09-30	91084
2008-12-31	71451
2009-03-31	72808
2009-06-30	71237
2009-09-30	72383
2009-12-31	67695
2010-03-31	52856
2010-06-30	57478
2010-09-30	60276
2010-12-31	57393
2011-03-31	57730
2011-06-30	49622
2011-09-30	36386
2011-12-31	37368
2012-03-31	41700
2012-06-30	36182
2012-09-30	36118
2012-12-31	37236
2013-03-31	38947
2013-06-30	30880
2013-09-30	33331
2013-12-31	31110
2014-03-31	26083
2014-06-30	36658
2014-09-30	26945
2014-12-31	24827
2015-03-31	30238
2015-06-30	29922
2015-09-30	29415
2015-12-31	26553
2016-03-31	27567
2016-06-30	25596
2016-09-30	25355
2016-12-31	24375
2017-03-31	24466
2017-06-30	30765
2017-09-30	29576
2017-12-31	38013
2018-03-31	36633
2018-06-30	33159
2018-09-30	32555
2018-12-31	23595
2019-03-31	17957
2019-06-30	15088
2019-09-30	24523
2019-12-31	19136
2020-03-31	22329
2020-06-30	18662
2020-09-30	23155
2020-12-31	16921
2021-03-31	24484
2021-06-30	23962
2021-09-30	21985
2021-12-31	16975
2022-03-31	26994
2022-06-30	27189
2022-09-30	20780
2022-12-31	28866
2023-03-31	19658
2023-06-30	26896
2023-09-30	27562