Quarter	US dollars
1999-03-31	421
1999-06-30	393
1999-09-30	364
1999-12-31	377
2000-03-31	399
2000-06-30	380
2000-09-30	375
2000-12-31	346
2001-03-31	338
2001-06-30	363
2001-09-30	353
2001-12-31	336
2002-03-31	326
2002-06-30	405
2002-09-30	357
2002-12-31	330
2003-03-31	309
2003-06-30	460
2003-09-30	415
2003-12-31	434
2004-03-31	435
2004-06-30	503
2004-09-30	655
2004-12-31	487
2005-03-31	560
2005-06-30	488
2005-09-30	588
2005-12-31	608
2006-03-31	659
2006-06-30	852
2006-09-30	776
2006-12-31	602
2007-03-31	641
2007-06-30	755
2007-09-30	580
2007-12-31	1017
2008-03-31	956
2008-06-30	1172
2008-09-30	993
2008-12-31	695
2009-03-31	602
2009-06-30	725
2009-09-30	1340
2009-12-31	982
2010-03-31	857
2010-06-30	742
2010-09-30	817
2010-12-31	882
2011-03-31	991
2011-06-30	1184
2011-09-30	1051
2011-12-31	1142
2012-03-31	1064
2012-06-30	1157
2012-09-30	1251
2012-12-31	1570
2013-03-31	1520
2013-06-30	1514
2013-09-30	1510
2013-12-31	1679
2014-03-31	1462
2014-06-30	1576
2014-09-30	1488
2014-12-31	1301
2015-03-31	1315
2015-06-30	1451