Quarter	US dollars
1999-03-31	1220
1999-06-30	1137
1999-09-30	1120
1999-12-31	1071
2000-03-31	1044
2000-06-30	1036
2000-09-30	1056
2000-12-31	1056
2001-03-31	993
2001-06-30	968
2001-09-30	980
2001-12-31	949
2002-03-31	975
2002-06-30	967
2002-09-30	889
2002-12-31	925
2003-03-31	908
2003-06-30	864
2003-09-30	794
2003-12-31	780
2004-03-31	706
2004-06-30	723
2004-09-30	726
2004-12-31	889
2005-03-31	821
2005-06-30	797
2005-09-30	725
2005-12-31	707
2006-03-31	662
2006-06-30	532
2006-09-30	496
2006-12-31	210
2007-03-31	218
2007-06-30	245
2007-09-30	248
2007-12-31	219
2008-03-31	232
2008-06-30	241
2008-09-30	243
2008-12-31	164
2009-03-31	107
2009-06-30	176
2009-09-30	125
2009-12-31	126
2010-03-31	89
2010-06-30	232
2010-09-30	261
2010-12-31	154
2011-03-31	117
2011-06-30	101
2011-09-30	80
2011-12-31	118
2012-03-31	124
2012-06-30	202
2012-09-30	158
2012-12-31	232
2013-03-31	169
2013-06-30	169
2013-09-30	142
2013-12-31	59
2014-03-31	70
2014-06-30	83
2014-09-30	87
2014-12-31	257
2015-03-31	221
2015-06-30	306
2015-09-30	149
2015-12-31	181
2016-03-31	162
2016-06-30	186
2016-09-30	159
2016-12-31	139
2017-03-31	220
2017-06-30	211
2017-09-30	220
2017-12-31	196
2018-03-31	263
2018-06-30	238
2018-09-30	256
2018-12-31	227
2019-03-31	265
2019-06-30	219
2019-09-30	164
2019-12-31	169
2020-03-31	213
2020-06-30	177
2020-09-30	125
2020-12-31	138
2021-03-31	203
2021-06-30	167
2021-09-30	137
2021-12-31	155
2022-03-31	202
2022-06-30	252
2022-09-30	257
2022-12-31	253
2023-03-31	286
2023-06-30	347
2023-09-30	284