Quarter	US dollars
1999-03-31	176
1999-06-30	177
1999-09-30	163
1999-12-31	223
2000-03-31	223
2000-06-30	280
2000-09-30	220
2000-12-31	195
2001-03-31	160
2001-06-30	158
2001-09-30	170
2001-12-31	160
2002-03-31	183
2002-06-30	171
2002-09-30	170
2002-12-31	177
2003-03-31	162
2003-06-30	208
2003-09-30	224
2003-12-31	200
2004-03-31	276
2004-06-30	262
2004-09-30	271
2004-12-31	289
2005-03-31	293
2005-06-30	306
2005-09-30	316
2005-12-31	333
2006-03-31	311
2006-06-30	312
2006-09-30	292
2006-12-31	350
2007-03-31	330
2007-06-30	483
2007-09-30	393
2007-12-31	378
2008-03-31	451
2008-06-30	385
2008-09-30	417
2008-12-31	551
2009-03-31	614
2009-06-30	671
2009-09-30	498
2009-12-31	659
2010-03-31	485
2010-06-30	294
2010-09-30	331
2010-12-31	289
2011-03-31	300
2011-06-30	272
2011-09-30	225
2011-12-31	317
2012-03-31	356
2012-06-30	562
2012-09-30	518
2012-12-31	509
2013-03-31	515
2013-06-30	389
2013-09-30	317
2013-12-31	298
2014-03-31	190
2014-06-30	308
2014-09-30	184
2014-12-31	191
2015-03-31	237
2015-06-30	168
2015-09-30	298
2015-12-31	261
2016-03-31	267
2016-06-30	208
2016-09-30	244
2016-12-31	170
2017-03-31	267
2017-06-30	237
2017-09-30	255
2017-12-31	325
2018-03-31	224
2018-06-30	259
2018-09-30	237
2018-12-31	171
2019-03-31	207
2019-06-30	232
2019-09-30	188
2019-12-31	303
2020-03-31	318
2020-06-30	191
2020-09-30	353
2020-12-31	393
2021-03-31	237
2021-06-30	244
2021-09-30	377
2021-12-31	372
2022-03-31	424
2022-06-30	425
2022-09-30	457
2022-12-31	558
2023-03-31	541
2023-06-30	471
2023-09-30	416