Quarter	US dollars
1999-03-31	259
1999-06-30	285
1999-09-30	276
1999-12-31	233
2000-03-31	238
2000-06-30	241
2000-09-30	238
2000-12-31	240
2001-03-31	235
2001-06-30	235
2001-09-30	236
2001-12-31	317
2002-03-31	317
2002-06-30	394
2002-09-30	280
2002-12-31	532
2003-03-31	589
2003-06-30	645
2003-09-30	582
2003-12-31	527
2004-03-31	586
2004-06-30	524
2004-09-30	693
2004-12-31	532
2005-03-31	544
2005-06-30	687
2005-09-30	582
2005-12-31	655
2006-03-31	694
2006-06-30	590
2006-09-30	648
2006-12-31	394
2007-03-31	174
2007-06-30	258
2007-09-30	234
2007-12-31	234
2008-03-31	218
2008-06-30	237
2008-09-30	228
2008-12-31	186
2009-03-31	251
2009-06-30	266
2009-09-30	263
2009-12-31	270
2010-03-31	245
2010-06-30	231
2010-09-30	248
2010-12-31	250
2011-03-31	361
2011-06-30	338
2011-09-30	312
2011-12-31	310
2012-03-31	306
2012-06-30	194
2012-09-30	208
2012-12-31	173
2013-03-31	156
2013-06-30	162
2013-09-30	144
2013-12-31	83
2014-03-31	117
2014-06-30	122
2014-09-30	137
2014-12-31	127
2015-03-31	135
2015-06-30	150
2015-09-30	117
2015-12-31	118
2016-03-31	117
2016-06-30	134
2016-09-30	130
2016-12-31	125
2017-03-31	131
2017-06-30	92
2017-09-30	76
2017-12-31	110
2018-03-31	79
2018-06-30	82
2018-09-30	84
2018-12-31	34
2019-03-31	31
2019-06-30	23
2019-09-30	156
2019-12-31	154
2020-03-31	139
2020-06-30	176
2020-09-30	170
2020-12-31	172
2021-03-31	174
2021-06-30	252
2021-09-30	231
2021-12-31	227
2022-03-31	204
2022-06-30	133
2022-09-30	84
2022-12-31	92
2023-03-31	163
2023-06-30	178
2023-09-30	174