Quarter	US dollars
2004-12-31	20433
2005-03-31	20887
2005-06-30	23614
2005-09-30	22570
2005-12-31	25270
2006-03-31	25209
2006-06-30	26232
2006-09-30	25964
2006-12-31	27899
2007-03-31	27270
2007-06-30	28914
2007-09-30	30590
2007-12-31	32788
2008-03-31	33623
2008-06-30	34546
2008-09-30	30036
2008-12-31	25165
2009-03-31	24328
2009-06-30	26576
2009-09-30	24751
2009-12-31	25549
2010-03-31	30219
2010-06-30	29756
2010-09-30	30977
2010-12-31	30623
2011-03-31	33358
2011-06-30	36728
2011-09-30	31199
2011-12-31	31613
2012-03-31	34179
2012-06-30	32892
2012-09-30	32723
2012-12-31	33154
2013-03-31	32305
2013-06-30	29799
2013-09-30	28612
2013-12-31	31301
2014-03-31	31279
2014-06-30	35369
2014-09-30	34737
2014-12-31	31943
2015-03-31	30545
2015-06-30	28290
2015-09-30	25295
2015-12-31	25358
2016-03-31	29491
2016-06-30	25206
2016-09-30	23399
2016-12-31	22578
2017-03-31	24426
2017-06-30	26493
2017-09-30	27013
2017-12-31	27755
2018-03-31	29871
2018-06-30	28393
2018-09-30	30799
2018-12-31	30432
2019-03-31	33169
2019-06-30	32549
2019-09-30	31611
2019-12-31	32324
2020-03-31	26439
2020-06-30	28094
2020-09-30	26203
2020-12-31	29310
2021-03-31	27440
2021-06-30	29441
2021-09-30	28509
2021-12-31	28063
2022-03-31	29836
2022-06-30	28935
2022-09-30	30156
2022-12-31	31979
2023-03-31	34317
2023-06-30	36978
2023-09-30	37671