Quarter	US dollars
1999-03-31	43388
1999-06-30	43706
1999-09-30	43749
1999-12-31	39172
2000-03-31	46505
2000-06-30	43209
2000-09-30	40411
2000-12-31	42455
2001-03-31	43381
2001-06-30	36240
2001-09-30	42309
2001-12-31	39242
2002-03-31	38580
2002-06-30	39564
2002-09-30	39604
2002-12-31	37734
2003-03-31	40387
2003-06-30	41264
2003-09-30	39341
2003-12-31	38122
2004-03-31	42967
2004-06-30	39700
2004-09-30	40233
2004-12-31	36780
2005-03-31	39759
2005-06-30	42322
2005-09-30	38275
2005-12-31	38859
2006-03-31	49514
2006-06-30	46720
2006-09-30	40463
2006-12-31	39308
2007-03-31	40297
2007-06-30	40643
2007-09-30	53012
2007-12-31	53376
2008-03-31	60809
2008-06-30	59141
2008-09-30	53950
2008-12-31	47366
2009-03-31	50178
2009-06-30	51030
2009-09-30	46436
2009-12-31	48784
2010-03-31	44160
2010-06-30	46987
2010-09-30	55793
2010-12-31	65769
2011-03-31	75742
2011-06-30	86878
2011-09-30	118372
2011-12-31	137950
2012-03-31	98537
2012-06-30	110233
2012-09-30	127467
2012-12-31	121902
2013-03-31	127846
2013-06-30	97322
2013-09-30	99019
2013-12-31	110858
2014-03-31	104121
2014-06-30	91355
2014-09-30	106394
2014-12-31	88905
2015-03-31	85636
2015-06-30	77738
2015-09-30	74753
2015-12-31	74573