Quarter	US dollars
1999-03-31	367
1999-06-30	361
1999-09-30	354
1999-12-31	345
2000-03-31	351
2000-06-30	351
2000-09-30	348
2000-12-31	346
2001-03-31	342
2001-06-30	331
2001-09-30	347
2001-12-31	341
2002-03-31	332
2002-06-30	314
2002-09-30	291
2002-12-31	265
2003-03-31	262
2003-06-30	267
2003-09-30	257
2003-12-31	260
2004-03-31	269
2004-06-30	263
2004-09-30	263
2004-12-31	267
2005-03-31	250
2005-06-30	228
2005-09-30	236
2005-12-31	229
2006-03-31	211
2006-06-30	204
2006-09-30	208
2006-12-31	206
2007-03-31	222
2007-06-30	208
2007-09-30	206
2007-12-31	340
2008-03-31	192
2008-06-30	168
2008-09-30	182
2008-12-31	165
2009-03-31	167
2009-06-30	197
2009-09-30	185
2009-12-31	165
2010-03-31	174
2010-06-30	167
2010-09-30	163
2010-12-31	165
2011-03-31	196
2011-06-30	200
2011-09-30	184
2011-12-31	183
2012-03-31	196
2012-06-30	163
2012-09-30	217
2012-12-31	180
2013-03-31	178
2013-06-30	164
2013-09-30	138
2013-12-31	139
2014-03-31	139
2014-06-30	136
2014-09-30	116
2014-12-31	115
2015-03-31	113
2015-06-30	137
2015-09-30	141
2015-12-31	143
2016-03-31	107
2016-06-30	106
2016-09-30	103
2016-12-31	111
2017-03-31	108
2017-06-30	106
2017-09-30	105
2017-12-31	97
2018-03-31	95
2018-06-30	82
2018-09-30	83
2018-12-31	87
2019-03-31	84
2019-06-30	85
2019-09-30	75
2019-12-31	73
2020-03-31	76
2020-06-30	71
2020-09-30	71
2020-12-31	71
2021-03-31	69
2021-06-30	70
2021-09-30	67
2021-12-31	66
2022-03-31	65
2022-06-30	64
2022-09-30	64
2022-12-31	63
2023-03-31	63
2023-06-30	64
2023-09-30	67