Quarter	US dollars
1999-03-31	996
1999-06-30	957
1999-09-30	879
1999-12-31	829
2000-03-31	874
2000-06-30	743
2000-09-30	603
2000-12-31	1152
2001-03-31	873
2001-06-30	795
2001-09-30	757
2001-12-31	878
2002-03-31	1211
2002-06-30	1144
2002-09-30	1232
2002-12-31	1361
2003-03-31	1443
2003-06-30	1869
2003-09-30	1905
2003-12-31	1595
2004-03-31	1777
2004-06-30	1496
2004-09-30	1502
2004-12-31	1536
2005-03-31	1544
2005-06-30	1480
2005-09-30	1548
2005-12-31	1410
2006-03-31	1581
2006-06-30	1718
2006-09-30	1955
2006-12-31	1772
2007-03-31	1586
2007-06-30	1204
2007-09-30	1338
2007-12-31	1494
2008-03-31	1239
2008-06-30	1349
2008-09-30	1097
2008-12-31	1297
2009-03-31	1202
2009-06-30	1272
2009-09-30	1380
2009-12-31	1064
2010-03-31	1006
2010-06-30	961
2010-09-30	1138
2010-12-31	832
2011-03-31	891
2011-06-30	883
2011-09-30	791
2011-12-31	563
2012-03-31	665
2012-06-30	597
2012-09-30	1074
2012-12-31	1032
2013-03-31	1483
2013-06-30	926
2013-09-30	1193
2013-12-31	825
2014-03-31	852
2014-06-30	1472
2014-09-30	1225
2014-12-31	811
2015-03-31	973
2015-06-30	726
2015-09-30	826
2015-12-31	1115
2016-03-31	690
2016-06-30	582
2016-09-30	497
2016-12-31	940
2017-03-31	483
2017-06-30	502
2017-09-30	722
2017-12-31	710
2018-03-31	785
2018-06-30	804
2018-09-30	489
2018-12-31	590
2019-03-31	621
2019-06-30	971
2019-09-30	545
2019-12-31	780
2020-03-31	1199
2020-06-30	987
2020-09-30	744
2020-12-31	1533
2021-03-31	889
2021-06-30	991
2021-09-30	1007
2021-12-31	789
2022-03-31	1267
2022-06-30	1327
2022-09-30	2207
2022-12-31	1329
2023-03-31	1239
2023-06-30	1266
2023-09-30	649