Quarter	US dollars
1991-12-31	0
1992-03-31	1
1992-06-30	7
1992-09-30	7
1992-12-31	12
1993-03-31	38
1993-06-30	12
1993-09-30	61
1993-12-31	93
1994-03-31	122
1994-06-30	183
1994-09-30	149
1994-12-31	159
1995-03-31	67
1995-06-30	97
1995-09-30	137
1995-12-31	131
1996-03-31	124
1996-06-30	98
1996-09-30	153
1996-12-31	227
1997-03-31	189
1997-06-30	265
1997-09-30	313
1997-12-31	205
1998-03-31	156
1998-06-30	183
1998-09-30	258
1998-12-31	114
1999-03-31	117
1999-06-30	222
1999-09-30	176
1999-12-31	312
2000-03-31	297
2000-06-30	348
2000-09-30	342
2000-12-31	247
2001-03-31	207
2001-06-30	157
2001-09-30	267
2001-12-31	106
2002-03-31	47
2002-06-30	238
2002-09-30	182
2002-12-31	198
2003-03-31	282
2003-06-30	79
2003-09-30	204
2003-12-31	164
2004-03-31	447
2004-06-30	194
2004-09-30	227
2004-12-31	438
2005-03-31	186
2005-06-30	249
2005-09-30	315
2005-12-31	261
2006-03-31	371
2006-06-30	262
2006-09-30	420
2006-12-31	525
2007-03-31	373
2007-06-30	584
2007-09-30	774
2007-12-31	764
2008-03-31	472
2008-06-30	122
2008-09-30	206
2008-12-31	134
2009-03-31	65
2009-06-30	112
2009-09-30	69
2009-12-31	85
2010-03-31	137
2010-06-30	37
2010-09-30	57
2010-12-31	44
2011-03-31	87
2011-06-30	181
2011-09-30	989
2011-12-31	60
2012-03-31	609
2012-06-30	569
2012-09-30	84
2012-12-31	76
2013-03-31	46
2013-06-30	339
2013-09-30	462
2013-12-31	122
2014-03-31	56
2014-06-30	72
2014-09-30	201
2014-12-31	276
2015-03-31	51
2015-06-30	125
2015-09-30	110
2015-12-31	102
2016-03-31	124
2016-06-30	117
2016-09-30	129
2016-12-31	127
2017-03-31	130
2017-06-30	169
2017-09-30	178
2017-12-31	154
2018-03-31	134
2018-06-30	189
2018-09-30	102
2018-12-31	158
2019-03-31	91
2019-06-30	169
2019-09-30	100
2019-12-31	134
2020-03-31	75
2020-06-30	143
2020-09-30	86
2020-12-31	172
2021-03-31	101
2021-06-30	174
2021-09-30	107
2021-12-31	121
2022-03-31	77
2022-06-30	80
2022-09-30	82
2022-12-31	51
2023-03-31	54
2023-06-30	61
2023-09-30	58