Quarter	US dollars
1999-03-31	312
1999-06-30	290
1999-09-30	322
1999-12-31	281
2000-03-31	294
2000-06-30	253
2000-09-30	210
2000-12-31	193
2001-03-31	182
2001-06-30	225
2001-09-30	232
2001-12-31	227
2002-03-31	242
2002-06-30	243
2002-09-30	263
2002-12-31	281
2003-03-31	215
2003-06-30	217
2003-09-30	208
2003-12-31	217
2004-03-31	246
2004-06-30	250
2004-09-30	230
2004-12-31	273
2005-03-31	251
2005-06-30	209
2005-09-30	196
2005-12-31	211
2006-03-31	249
2006-06-30	223
2006-09-30	260
2006-12-31	214
2007-03-31	196
2007-06-30	200
2007-09-30	170
2007-12-31	289
2008-03-31	295
2008-06-30	741
2008-09-30	317
2008-12-31	348
2009-03-31	243
2009-06-30	261
2009-09-30	333
2009-12-31	285
2010-03-31	161
2010-06-30	161
2010-09-30	169
2010-12-31	131
2011-03-31	212
2011-06-30	153
2011-09-30	169
2011-12-31	190
2012-03-31	205
2012-06-30	208
2012-09-30	172
2012-12-31	180
2013-03-31	166
2013-06-30	177
2013-09-30	161
2013-12-31	174
2014-03-31	206
2014-06-30	276
2014-09-30	227
2014-12-31	256
2015-03-31	325
2015-06-30	323
2015-09-30	428
2015-12-31	337
2016-03-31	337
2016-06-30	317
2016-09-30	273
2016-12-31	336
2017-03-31	332
2017-06-30	302
2017-09-30	320
2017-12-31	365
2018-03-31	326
2018-06-30	238
2018-09-30	403
2018-12-31	297
2019-03-31	340
2019-06-30	406
2019-09-30	393
2019-12-31	450
2020-03-31	624
2020-06-30	613
2020-09-30	579
2020-12-31	800
2021-03-31	966
2021-06-30	1015
2021-09-30	663
2021-12-31	580
2022-03-31	731
2022-06-30	648
2022-09-30	662
2022-12-31	551
2023-03-31	659
2023-06-30	647
2023-09-30	539