Quarter	US dollars
2004-12-31	18851
2005-03-31	20341
2005-06-30	18097
2005-09-30	18806
2005-12-31	16416
2006-03-31	18027
2006-06-30	18975
2006-09-30	25028
2006-12-31	24819
2007-03-31	28841
2007-06-30	28563
2007-09-30	36172
2007-12-31	30526
2008-03-31	33575
2008-06-30	34823
2008-09-30	31534
2008-12-31	26616
2009-03-31	23997
2009-06-30	26072
2009-09-30	24906
2009-12-31	24283
2010-03-31	24945
2010-06-30	24940
2010-09-30	25134
2010-12-31	39430
2011-03-31	48358
2011-06-30	40288
2011-09-30	36843
2011-12-31	28646
2012-03-31	28552
2012-06-30	28533
2012-09-30	26336
2012-12-31	29350
2013-03-31	32093
2013-06-30	30419
2013-09-30	30762
2013-12-31	35218
2014-03-31	34827
2014-06-30	33088
2014-09-30	29746
2014-12-31	29696
2015-03-31	24272
2015-06-30	22305
2015-09-30	27790
2015-12-31	21322
2016-03-31	24911
2016-06-30	23584
2016-09-30	20853
2016-12-31	19655
2017-03-31	20993
2017-06-30	24215
2017-09-30	24126
2017-12-31	20762
2018-03-31	23411
2018-06-30	25050
2018-09-30	26880
2018-12-31	31320
2019-03-31	32099
2019-06-30	33053
2019-09-30	27061
2019-12-31	22276
2020-03-31	28023
2020-06-30	27494
2020-09-30	21560
2020-12-31	20992
2021-03-31	24088
2021-06-30	21649
2021-09-30	23675
2021-12-31	23848
2022-03-31	29470
2022-06-30	29035
2022-09-30	27569
2022-12-31	27978
2023-03-31	29547
2023-06-30	31009
2023-09-30	36199