Quarter	US dollars
1999-03-31	339949
1999-06-30	307121
1999-09-30	331880
1999-12-31	301715
2000-03-31	323079
2000-06-30	332609
2000-09-30	312301
2000-12-31	337998
2001-03-31	391409
2001-06-30	355528
2001-09-30	407868
2001-12-31	384286
2002-03-31	357702
2002-06-30	423888
2002-09-30	465017
2002-12-31	540247
2003-03-31	613334
2003-06-30	689230
2003-09-30	646803
2003-12-31	708429
2004-03-31	735224
2004-06-30	752392
2004-09-30	785450
2004-12-31	835048
2005-03-31	893461
2005-06-30	857298
2005-09-30	877942
2005-12-31	825612
2006-03-31	934751
2006-06-30	995484
2006-09-30	982211
2006-12-31	1044399
2007-03-31	1230293
2007-06-30	1278411
2007-09-30	1393327
2007-12-31	1449931
2008-03-31	1633664
2008-06-30	1429391
2008-09-30	1287219
2008-12-31	1315629
2009-03-31	1204086
2009-06-30	1203125
2009-09-30	1248362
2009-12-31	1265523
2010-03-31	1192649
2010-06-30	1084741
2010-09-30	1183466
2010-12-31	1082211
2011-03-31	1218083
2011-06-30	1235565
2011-09-30	1225779
2011-12-31	1143077
2012-03-31	1256020
2012-06-30	1170394
2012-09-30	1145150
2012-12-31	1135678
2013-03-31	1068903
2013-06-30	1021355
2013-09-30	959129
2013-12-31	971352
2014-03-31	1013496
2014-06-30	1050669
2014-09-30	951763
2014-12-31	900326
2015-03-31	850454
2015-06-30	781032
2015-09-30	759491
2015-12-31	720110