Quarter	US dollars
1999-03-31	166
1999-06-30	183
1999-09-30	202
1999-12-31	160
2000-03-31	124
2000-06-30	125
2000-09-30	87
2000-12-31	67
2001-03-31	18
2001-06-30	101
2001-09-30	115
2001-12-31	138
2002-03-31	100
2002-06-30	176
2002-09-30	168
2002-12-31	132
2003-03-31	152
2003-06-30	200
2003-09-30	191
2003-12-31	309
2004-03-31	347
2004-06-30	618
2004-09-30	519
2004-12-31	553
2005-03-31	459
2005-06-30	715
2005-09-30	475
2005-12-31	1555
2006-03-31	1627
2006-06-30	1652
2006-09-30	2030
2006-12-31	2196
2007-03-31	2626
2007-06-30	2976
2007-09-30	3500
2007-12-31	3804
2008-03-31	4246
2008-06-30	4296
2008-09-30	4859
2008-12-31	4685
2009-03-31	4736
2009-06-30	4563
2009-09-30	4581
2009-12-31	4607
2010-03-31	4668
2010-06-30	4504
2010-09-30	3723
2010-12-31	4026
2011-03-31	4196
2011-06-30	4637
2011-09-30	4643
2011-12-31	4778
2012-03-31	4894
2012-06-30	4921
2012-09-30	4741
2012-12-31	4717
2013-03-31	4403
2013-06-30	4049
2013-09-30	3632
2013-12-31	3646
2014-03-31	3875
2014-06-30	3111
2014-09-30	2890
2014-12-31	2931
2015-03-31	2981
2015-06-30	4517