Quarter	US dollars
1999-03-31	969
1999-06-30	1108
1999-09-30	1451
1999-12-31	1399
2000-03-31	1423
2000-06-30	1613
2000-09-30	1301
2000-12-31	1311
2001-03-31	1255
2001-06-30	1489
2001-09-30	1696
2001-12-31	1475
2002-03-31	626
2002-06-30	590
2002-09-30	511
2002-12-31	263
2003-03-31	312
2003-06-30	308
2003-09-30	291
2003-12-31	404
2004-03-31	276
2004-06-30	283
2004-09-30	363
2004-12-31	272
2005-03-31	383
2005-06-30	594
2005-09-30	462
2005-12-31	527
2006-03-31	788
2006-06-30	906
2006-09-30	1092
2006-12-31	1347
2007-03-31	1634
2007-06-30	2069
2007-09-30	1729
2007-12-31	1900
2008-03-31	1908
2008-06-30	1728
2008-09-30	1695
2008-12-31	711
2009-03-31	1324
2009-06-30	1141
2009-09-30	991
2009-12-31	910
2010-03-31	828
2010-06-30	665
2010-09-30	857
2010-12-31	563
2011-03-31	587
2011-06-30	535
2011-09-30	542
2011-12-31	523
2012-03-31	475
2012-06-30	443
2012-09-30	439
2012-12-31	322
2013-03-31	421
2013-06-30	182
2013-09-30	288
2013-12-31	217
2014-03-31	172
2014-06-30	188
2014-09-30	157
2014-12-31	114
2015-03-31	72
2015-06-30	117
2015-09-30	121
2015-12-31	184
2016-03-31	1655
2016-06-30	1823
2016-09-30	255
2016-12-31	346
2017-03-31	360
2017-06-30	383
2017-09-30	1181
2017-12-31	1029
2018-03-31	829
2018-06-30	346
2018-09-30	190
2018-12-31	187
2019-03-31	248
2019-06-30	377
2019-09-30	285
2019-12-31	606
2020-03-31	355
2020-06-30	144
2020-09-30	217
2020-12-31	120
2021-03-31	161
2021-06-30	118
2021-09-30	139
2021-12-31	106
2022-03-31	115
2022-06-30	197
2022-09-30	99
2022-12-31	72
2023-03-31	26
2023-06-30	78
2023-09-30	31