Quarter	US dollars
1999-03-31	85810
1999-06-30	140515
1999-09-30	70465
1999-12-31	33168
2000-03-31	54770
2000-06-30	58011
2000-09-30	53197
2000-12-31	32687
2001-03-31	35656
2001-06-30	27826
2001-09-30	25995
2001-12-31	26364
2002-03-31	21679
2002-06-30	28270
2002-09-30	40223
2002-12-31	42926
2003-03-31	49771
2003-06-30	56686
2003-09-30	58715
2003-12-31	60493
2004-03-31	72017
2004-06-30	61935
2004-09-30	66375
2004-12-31	69093
2005-03-31	81631
2005-06-30	78312
2005-09-30	81642
2005-12-31	85783
2006-03-31	94230
2006-06-30	113003
2006-09-30	123546
2006-12-31	117503
2007-03-31	136506
2007-06-30	134270
2007-09-30	156943
2007-12-31	139805
2008-03-31	154370
2008-06-30	121097
2008-09-30	136007
2008-12-31	63808
2009-03-31	62559
2009-06-30	51217
2009-09-30	54579
2009-12-31	62850
2010-03-31	60943
2010-06-30	62568
2010-09-30	54938
2010-12-31	67067
2011-03-31	72911
2011-06-30	49120
2011-09-30	72859
2011-12-31	49100
2012-03-31	57177
2012-06-30	49908
2012-09-30	35030
2012-12-31	36776
2013-03-31	36678
2013-06-30	28151
2013-09-30	40201
2013-12-31	41171
2014-03-31	30097
2014-06-30	25252
2014-09-30	29735
2014-12-31	23546
2015-03-31	23456
2015-06-30	25573
2015-09-30	30870
2015-12-31	28266