Quarter	US dollars
2004-12-31	4590
2005-03-31	5348
2005-06-30	5501
2005-09-30	6177
2005-12-31	5164
2006-03-31	5455
2006-06-30	5337
2006-09-30	5672
2006-12-31	6556
2007-03-31	6784
2007-06-30	8214
2007-09-30	11768
2007-12-31	12443
2008-03-31	13837
2008-06-30	14438
2008-09-30	13893
2008-12-31	15190
2009-03-31	14342
2009-06-30	13911
2009-09-30	15911
2009-12-31	15822
2010-03-31	15087
2010-06-30	18022
2010-09-30	21485
2010-12-31	22612
2011-03-31	21647
2011-06-30	24911
2011-09-30	25765
2011-12-31	26630
2012-03-31	27324
2012-06-30	29968
2012-09-30	28792
2012-12-31	31489
2013-03-31	35970
2013-06-30	32720
2013-09-30	35214
2013-12-31	35477
2014-03-31	37237
2014-06-30	37579
2014-09-30	38500
2014-12-31	39171
2015-03-31	37077
2015-06-30	37190
2015-09-30	32854
2015-12-31	34392
2016-03-31	31310
2016-06-30	29786
2016-09-30	26933
2016-12-31	26987
2017-03-31	28872
2017-06-30	21150
2017-09-30	20100
2017-12-31	20114
2018-03-31	19723
2018-06-30	19134
2018-09-30	20667
2018-12-31	23468
2019-03-31	24968
2019-06-30	23899
2019-09-30	25631
2019-12-31	24763
2020-03-31	25917
2020-06-30	26482
2020-09-30	25503
2020-12-31	25670
2021-03-31	30521
2021-06-30	31547
2021-09-30	32985
2021-12-31	30240
2022-03-31	31197
2022-06-30	28875
2022-09-30	28446
2022-12-31	26706
2023-03-31	25476
2023-06-30	25261
2023-09-30	24206