Quarter	US dollars
2004-12-31	1851
2005-03-31	1393
2005-06-30	1825
2005-09-30	2043
2005-12-31	2196
2006-03-31	2184
2006-06-30	2175
2006-09-30	2365
2006-12-31	2020
2007-03-31	2573
2007-06-30	2570
2007-09-30	2742
2007-12-31	2903
2008-03-31	3102
2008-06-30	3035
2008-09-30	2686
2008-12-31	2753
2009-03-31	2832
2009-06-30	2931
2009-09-30	2836
2009-12-31	2697
2010-03-31	4048
2010-06-30	3844
2010-09-30	3075
2010-12-31	2707
2011-03-31	2299
2011-06-30	3242
2011-09-30	4328
2011-12-31	3663
2012-03-31	3597
2012-06-30	3354
2012-09-30	3583
2012-12-31	3014
2013-03-31	2995
2013-06-30	2651
2013-09-30	1678
2013-12-31	1701
2014-03-31	1731
2014-06-30	1381
2014-09-30	1328
2014-12-31	1336
2015-03-31	1305
2015-06-30	1332
2015-09-30	1341
2015-12-31	1209
2016-03-31	1392
2016-06-30	2104
2016-09-30	2245
2016-12-31	1505
2017-03-31	1872
2017-06-30	1817
2017-09-30	1870
2017-12-31	1437
2018-03-31	1263
2018-06-30	1190
2018-09-30	1020
2018-12-31	1045
2019-03-31	1618
2019-06-30	990
2019-09-30	950
2019-12-31	1711
2020-03-31	1673
2020-06-30	1696
2020-09-30	1613
2020-12-31	1600
2021-03-31	1468
2021-06-30	1309
2021-09-30	1346
2021-12-31	836
2022-03-31	666
2022-06-30	417
2022-09-30	394
2022-12-31	412
2023-03-31	613
2023-06-30	502
2023-09-30	636