Quarter	US dollars
1999-03-31	13056
1999-06-30	15842
1999-09-30	15665
1999-12-31	15284
2000-03-31	16119
2000-06-30	18281
2000-09-30	16916
2000-12-31	15149
2001-03-31	16129
2001-06-30	16764
2001-09-30	17852
2001-12-31	17595
2002-03-31	22511
2002-06-30	23284
2002-09-30	21044
2002-12-31	23208
2003-03-31	26844
2003-06-30	26185
2003-09-30	27827
2003-12-31	34123
2004-03-31	38339
2004-06-30	38011
2004-09-30	40300
2004-12-31	45673
2005-03-31	48178
2005-06-30	57036
2005-09-30	60854
2005-12-31	58547
2006-03-31	60052
2006-06-30	67529
2006-09-30	63915
2006-12-31	65380
2007-03-31	87259
2007-06-30	89747
2007-09-30	88766
2007-12-31	103228
2008-03-31	110200
2008-06-30	105233
2008-09-30	96796
2008-12-31	92306
2009-03-31	106042
2009-06-30	111676
2009-09-30	87024
2009-12-31	86565
2010-03-31	117050
2010-06-30	118621
2010-09-30	125658
2010-12-31	131771
2011-03-31	91459
2011-06-30	99143
2011-09-30	89279
2011-12-31	75371
2012-03-31	77510
2012-06-30	74490
2012-09-30	77644
2012-12-31	88019
2013-03-31	72883
2013-06-30	70529
2013-09-30	76354
2013-12-31	77828
2014-03-31	78417
2014-06-30	81304
2014-09-30	84256
2014-12-31	83507
2015-03-31	82823
2015-06-30	89056
2015-09-30	85594
2015-12-31	78033
2016-03-31	81007
2016-06-30	84365
2016-09-30	83838
2016-12-31	77617
2017-03-31	78243
2017-06-30	85586
2017-09-30	91945
2017-12-31	96879
2018-03-31	98793
2018-06-30	101987
2018-09-30	100249
2018-12-31	94874
2019-03-31	85234
2019-06-30	95508
2019-09-30	100805
2019-12-31	84025
2020-03-31	87514
2020-06-30	95151
2020-09-30	92851
2020-12-31	84474
2021-03-31	82857
2021-06-30	99105
2021-09-30	93311
2021-12-31	95195
2022-03-31	99455
2022-06-30	110515
2022-09-30	99565
2022-12-31	93591
2023-03-31	92149
2023-06-30	87332
2023-09-30	82621