Quarter	US dollars
1999-03-31	1924
1999-06-30	1644
1999-09-30	1589
1999-12-31	1262
2000-03-31	1008
2000-06-30	946
2000-09-30	897
2000-12-31	860
2001-03-31	907
2001-06-30	889
2001-09-30	711
2001-12-31	867
2002-03-31	937
2002-06-30	981
2002-09-30	974
2002-12-31	951
2003-03-31	938
2003-06-30	1043
2003-09-30	929
2003-12-31	872
2004-03-31	938
2004-06-30	990
2004-09-30	992
2004-12-31	1117
2005-03-31	1081
2005-06-30	1012
2005-09-30	986
2005-12-31	1209
2006-03-31	1349
2006-06-30	1425
2006-09-30	1361
2006-12-31	1402
2007-03-31	1963
2007-06-30	1835
2007-09-30	1682
2007-12-31	1457
2008-03-31	1225
2008-06-30	1245
2008-09-30	988
2008-12-31	953
2009-03-31	1016
2009-06-30	858
2009-09-30	984
2009-12-31	1084
2010-03-31	1103
2010-06-30	813
2010-09-30	1151
2010-12-31	1026
2011-03-31	908
2011-06-30	945
2011-09-30	1187
2011-12-31	1044
2012-03-31	867
2012-06-30	893
2012-09-30	997
2012-12-31	1397
2013-03-31	1381
2013-06-30	1493
2013-09-30	1559
2013-12-31	1605
2014-03-31	1700
2014-06-30	2194
2014-09-30	2151
2014-12-31	1759
2015-03-31	1758
2015-06-30	1706
2015-09-30	1828
2015-12-31	1630
2016-03-31	1417
2016-06-30	1377
2016-09-30	1396
2016-12-31	1005
2017-03-31	1096
2017-06-30	1415
2017-09-30	1231
2017-12-31	1114
2018-03-31	1212
2018-06-30	981
2018-09-30	1113
2018-12-31	1647
2019-03-31	1800
2019-06-30	1646
2019-09-30	1498
2019-12-31	1312
2020-03-31	1565
2020-06-30	1659
2020-09-30	1342
2020-12-31	1267
2021-03-31	1232
2021-06-30	1221
2021-09-30	1278
2021-12-31	1118
2022-03-31	1924
2022-06-30	1474
2022-09-30	1122
2022-12-31	883
2023-03-31	674
2023-06-30	1336
2023-09-30	1053