Quarter	US dollars
1999-03-31	1419
1999-06-30	1394
1999-09-30	1401
1999-12-31	1319
2000-03-31	1320
2000-06-30	1273
2000-09-30	1262
2000-12-31	1230
2001-03-31	1209
2001-06-30	1259
2001-09-30	1277
2001-12-31	1276
2002-03-31	1261
2002-06-30	1304
2002-09-30	1306
2002-12-31	1398
2003-03-31	1296
2003-06-30	1318
2003-09-30	1288
2003-12-31	1350
2004-03-31	1390
2004-06-30	1365
2004-09-30	1398
2004-12-31	1471
2005-03-31	1448
2005-06-30	1386
2005-09-30	1369
2005-12-31	1340
2006-03-31	1372
2006-06-30	1405
2006-09-30	1391
2006-12-31	1423
2007-03-31	1437
2007-06-30	1406
2007-09-30	1492
2007-12-31	1501
2008-03-31	1478
2008-06-30	1443
2008-09-30	1327
2008-12-31	1162
2009-03-31	1222
2009-06-30	1395
2009-09-30	1377
2009-12-31	1426
2010-03-31	1399
2010-06-30	1364
2010-09-30	1411
2010-12-31	1414
2011-03-31	1436
2011-06-30	1418
2011-09-30	1387
2011-12-31	1357
2012-03-31	1380
2012-06-30	1346
2012-09-30	1319
2012-12-31	1402
2013-03-31	1329
2013-06-30	1276
2013-09-30	1270
2013-12-31	1259
2014-03-31	1314
2014-06-30	1305
2014-09-30	1165
2014-12-31	1155
2015-03-31	1133
2015-06-30	1176
2015-09-30	1188
2015-12-31	1148
2016-03-31	1139
2016-06-30	1058
2016-09-30	1031
2016-12-31	998
2017-03-31	1016
2017-06-30	1025
2017-09-30	1053
2017-12-31	1002
2018-03-31	979
2018-06-30	608
2018-09-30	595
2018-12-31	399
2019-03-31	459
2019-06-30	323
2019-09-30	360
2019-12-31	469
2020-03-31	335
2020-06-30	387
2020-09-30	321
2020-12-31	332
2021-03-31	369
2021-06-30	385
2021-09-30	394
2021-12-31	425
2022-03-31	404
2022-06-30	498
2022-09-30	470
2022-12-31	469
2023-03-31	474
2023-06-30	578
2023-09-30	478