Quarter	US dollars
2004-12-31	1613
2005-03-31	1569
2005-06-30	1540
2005-09-30	1541
2005-12-31	1466
2006-03-31	2180
2006-06-30	2055
2006-09-30	2064
2006-12-31	2329
2007-03-31	2399
2007-06-30	2356
2007-09-30	2437
2007-12-31	2413
2008-03-31	2272
2008-06-30	2480
2008-09-30	2495
2008-12-31	2365
2009-03-31	1995
2009-06-30	2291
2009-09-30	2407
2009-12-31	2341
2010-03-31	2627
2010-06-30	2550
2010-09-30	2719
2010-12-31	2722
2011-03-31	2861
2011-06-30	2749
2011-09-30	2139
2011-12-31	1843
2012-03-31	825
2012-06-30	828
2012-09-30	723
2012-12-31	795
2013-03-31	724
2013-06-30	777
2013-09-30	828
2013-12-31	955
2014-03-31	1877
2014-06-30	2035
2014-09-30	1939
2014-12-31	2132
2015-03-31	2007
2015-06-30	2078
2015-09-30	1981
2015-12-31	1940
2016-03-31	1991
2016-06-30	2103
2016-09-30	2153
2016-12-31	2044
2017-03-31	2007
2017-06-30	1378
2017-09-30	1347
2017-12-31	1519
2018-03-31	1350
2018-06-30	1234
2018-09-30	1189
2018-12-31	1329
2019-03-31	1363
2019-06-30	1160
2019-09-30	1228
2019-12-31	1192
2020-03-31	1197
2020-06-30	1070
2020-09-30	1100
2020-12-31	1162
2021-03-31	1268
2021-06-30	1378
2021-09-30	1096
2021-12-31	916
2022-03-31	999
2022-06-30	885
2022-09-30	879
2022-12-31	857
2023-03-31	802
2023-06-30	838
2023-09-30	921