Quarter	US dollars
1999-03-31	977
1999-06-30	972
1999-09-30	1249
1999-12-31	1822
2000-03-31	1589
2000-06-30	2131
2000-09-30	2020
2000-12-31	1994
2001-03-31	2544
2001-06-30	2282
2001-09-30	2143
2001-12-31	2176
2002-03-31	2660
2002-06-30	2130
2002-09-30	2343
2002-12-31	2395
2003-03-31	1820
2003-06-30	1605
2003-09-30	1994
2003-12-31	2252
2004-03-31	2749
2004-06-30	2981
2004-09-30	2719
2004-12-31	2604
2005-03-31	2697
2005-06-30	2646
2005-09-30	3447
2005-12-31	4089
2006-03-31	3718
2006-06-30	3823
2006-09-30	5037
2006-12-31	5369
2007-03-31	4345
2007-06-30	5218
2007-09-30	5966
2007-12-31	6740
2008-03-31	4829
2008-06-30	3698
2008-09-30	3897
2008-12-31	4465
2009-03-31	4687
2009-06-30	4758
2009-09-30	4212
2009-12-31	5304
2010-03-31	4113
2010-06-30	5204
2010-09-30	5828
2010-12-31	4061
2011-03-31	3659
2011-06-30	4188
2011-09-30	4283
2011-12-31	4449
2012-03-31	5409
2012-06-30	5186
2012-09-30	4802
2012-12-31	5009
2013-03-31	4031
2013-06-30	2149
2013-09-30	1862
2013-12-31	2096
2014-03-31	1712
2014-06-30	1508
2014-09-30	1331
2014-12-31	1403
2015-03-31	1446
2015-06-30	1412
2015-09-30	1302
2015-12-31	1431
2016-03-31	1108
2016-06-30	840
2016-09-30	696
2016-12-31	696
2017-03-31	569
2017-06-30	458
2017-09-30	332
2017-12-31	592
2018-03-31	448
2018-06-30	521
2018-09-30	382
2018-12-31	291
2019-03-31	296
2019-06-30	371
2019-09-30	341
2019-12-31	232
2020-03-31	304
2020-06-30	273
2020-09-30	432
2020-12-31	458
2021-03-31	407
2021-06-30	441
2021-09-30	394
2021-12-31	406
2022-03-31	90
2022-06-30	110
2022-09-30	120
2022-12-31	81
2023-03-31	80
2023-06-30	74
2023-09-30	82