Quarter	US dollars
1999-03-31	1510
1999-06-30	1289
1999-09-30	1402
1999-12-31	950
2000-03-31	780
2000-06-30	956
2000-09-30	875
2000-12-31	888
2001-03-31	1466
2001-06-30	1399
2001-09-30	1213
2001-12-31	1017
2002-03-31	1081
2002-06-30	1410
2002-09-30	1666
2002-12-31	1631
2003-03-31	1251
2003-06-30	813
2003-09-30	1179
2003-12-31	730
2004-03-31	1106
2004-06-30	618
2004-09-30	656
2004-12-31	432
2005-03-31	738
2005-06-30	590
2005-09-30	466
2005-12-31	434
2006-03-31	755
2006-06-30	436
2006-09-30	342
2006-12-31	877
2007-03-31	1676
2007-06-30	1075
2007-09-30	899
2007-12-31	1356
2008-03-31	2267
2008-06-30	1595
2008-09-30	3114
2008-12-31	2976
2009-03-31	1753
2009-06-30	840
2009-09-30	307
2009-12-31	801
2010-03-31	1793
2010-06-30	2098
2010-09-30	1240
2010-12-31	1844
2011-03-31	1932
2011-06-30	1234
2011-09-30	768
2011-12-31	648
2012-03-31	1618
2012-06-30	1005
2012-09-30	1019
2012-12-31	596
2013-03-31	449
2013-06-30	760
2013-09-30	680
2013-12-31	948
2014-03-31	477
2014-06-30	695
2014-09-30	15
2014-12-31	738
2015-03-31	332
2015-06-30	166
2015-09-30	109
2015-12-31	347