Quarter	US dollars
1999-03-31	266
1999-06-30	250
1999-09-30	253
1999-12-31	240
2000-03-31	228
2000-06-30	203
2000-09-30	204
2000-12-31	227
2001-03-31	210
2001-06-30	216
2001-09-30	198
2001-12-31	224
2002-03-31	219
2002-06-30	235
2002-09-30	236
2002-12-31	242
2003-03-31	267
2003-06-30	255
2003-09-30	223
2003-12-31	231
2004-03-31	234
2004-06-30	225
2004-09-30	192
2004-12-31	196
2005-03-31	182
2005-06-30	163
2005-09-30	174
2005-12-31	147
2006-03-31	150
2006-06-30	140
2006-09-30	148
2006-12-31	153
2007-03-31	145
2007-06-30	145
2007-09-30	158
2007-12-31	241
2008-03-31	170
2008-06-30	230
2008-09-30	171
2008-12-31	113
2009-03-31	192
2009-06-30	127
2009-09-30	119
2009-12-31	127
2010-03-31	144
2010-06-30	116
2010-09-30	113
2010-12-31	105
2011-03-31	106
2011-06-30	169
2011-09-30	208
2011-12-31	355
2012-03-31	376
2012-06-30	763
2012-09-30	783
2012-12-31	700
2013-03-31	922
2013-06-30	916
2013-09-30	894
2013-12-31	897
2014-03-31	1159
2014-06-30	1124
2014-09-30	881
2014-12-31	972
2015-03-31	937
2015-06-30	879
2015-09-30	822
2015-12-31	1207
2016-03-31	1201
2016-06-30	1498
2016-09-30	1440
2016-12-31	1381
2017-03-31	1933
2017-06-30	1889
2017-09-30	1942
2017-12-31	2063
2018-03-31	1726
2018-06-30	1803
2018-09-30	1659
2018-12-31	1523
2019-03-31	1438
2019-06-30	1315
2019-09-30	1377
2019-12-31	1434
2020-03-31	1376
2020-06-30	1363
2020-09-30	1336
2020-12-31	1291
2021-03-31	1270
2021-06-30	1229
2021-09-30	1202
2021-12-31	1086
2022-03-31	1037
2022-06-30	964
2022-09-30	887
2022-12-31	832
2023-03-31	875
2023-06-30	774
2023-09-30	700