Quarter	US dollars
1999-03-31	65
1999-06-30	64
1999-09-30	72
1999-12-31	74
2000-03-31	54
2000-06-30	66
2000-09-30	67
2000-12-31	78
2001-03-31	60
2001-06-30	63
2001-09-30	70
2001-12-31	66
2002-03-31	68
2002-06-30	64
2002-09-30	104
2002-12-31	123
2003-03-31	111
2003-06-30	108
2003-09-30	111
2003-12-31	112
2004-03-31	84
2004-06-30	83
2004-09-30	94
2004-12-31	101
2005-03-31	111
2005-06-30	114
2005-09-30	117
2005-12-31	130
2006-03-31	150
2006-06-30	189
2006-09-30	217
2006-12-31	236
2007-03-31	268
2007-06-30	296
2007-09-30	294
2007-12-31	280
2008-03-31	305
2008-06-30	340
2008-09-30	346
2008-12-31	306
2009-03-31	300
2009-06-30	289
2009-09-30	364
2009-12-31	386
2010-03-31	404
2010-06-30	382
2010-09-30	417
2010-12-31	467
2011-03-31	485
2011-06-30	455
2011-09-30	436
2011-12-31	454
2012-03-31	494
2012-06-30	472
2012-09-30	494
2012-12-31	476
2013-03-31	475
2013-06-30	496
2013-09-30	543
2013-12-31	541
2014-03-31	614
2014-06-30	639
2014-09-30	586
2014-12-31	564
2015-03-31	521
2015-06-30	468
2015-09-30	422
2015-12-31	340
2016-03-31	267
2016-06-30	291
2016-09-30	275
2016-12-31	239
2017-03-31	210
2017-06-30	175
2017-09-30	152
2017-12-31	165
2018-03-31	147
2018-06-30	154
2018-09-30	136
2018-12-31	140
2019-03-31	162
2019-06-30	140
2019-09-30	144
2019-12-31	199
2020-03-31	226
2020-06-30	182
2020-09-30	171
2020-12-31	176
2021-03-31	199
2021-06-30	234
2021-09-30	230
2021-12-31	271
2022-03-31	342
2022-06-30	250
2022-09-30	226
2022-12-31	314
2023-03-31	321
2023-06-30	239
2023-09-30	253