Quarter	US dollars
1999-03-31	1308
1999-06-30	1363
1999-09-30	1351
1999-12-31	1383
2000-03-31	1357
2000-06-30	1434
2000-09-30	1385
2000-12-31	1389
2001-03-31	1368
2001-06-30	1401
2001-09-30	1364
2001-12-31	1317
2002-03-31	1258
2002-06-30	1221
2002-09-30	1153
2002-12-31	1147
2003-03-31	1092
2003-06-30	1114
2003-09-30	1091
2003-12-31	1129
2004-03-31	1098
2004-06-30	1159
2004-09-30	1125
2004-12-31	1181
2005-03-31	1102
2005-06-30	1168
2005-09-30	1040
2005-12-31	1118
2006-03-31	1008
2006-06-30	1147
2006-09-30	1102
2006-12-31	1541
2007-03-31	940
2007-06-30	906
2007-09-30	1011
2007-12-31	1545
2008-03-31	931
2008-06-30	891
2008-09-30	833
2008-12-31	769
2009-03-31	756
2009-06-30	794
2009-09-30	767
2009-12-31	765
2010-03-31	752
2010-06-30	741
2010-09-30	761
2010-12-31	750
2011-03-31	784
2011-06-30	803
2011-09-30	762
2011-12-31	704
2012-03-31	777
2012-06-30	711
2012-09-30	639
2012-12-31	534
2013-03-31	494
2013-06-30	487
2013-09-30	503
2013-12-31	518
2014-03-31	504
2014-06-30	500
2014-09-30	468
2014-12-31	443
2015-03-31	485
2015-06-30	458
2015-09-30	449
2015-12-31	667
2016-03-31	683
2016-06-30	599
2016-09-30	676
2016-12-31	651
2017-03-31	618
2017-06-30	743
2017-09-30	677
2017-12-31	643
2018-03-31	551
2018-06-30	519
2018-09-30	530
2018-12-31	578
2019-03-31	538
2019-06-30	499
2019-09-30	448
2019-12-31	380
2020-03-31	359
2020-06-30	360
2020-09-30	364
2020-12-31	374
2021-03-31	366
2021-06-30	424
2021-09-30	284
2021-12-31	271
2022-03-31	247
2022-06-30	413
2022-09-30	401
2022-12-31	411
2023-03-31	413
2023-06-30	390
2023-09-30	418