Quarter	US dollars
1999-03-31	143
1999-06-30	114
1999-09-30	194
1999-12-31	190
2000-03-31	177
2000-06-30	226
2000-09-30	150
2000-12-31	214
2001-03-31	188
2001-06-30	168
2001-09-30	160
2001-12-31	150
2002-03-31	174
2002-06-30	241
2002-09-30	161
2002-12-31	173
2003-03-31	151
2003-06-30	172
2003-09-30	235
2003-12-31	153
2004-03-31	160
2004-06-30	118
2004-09-30	235
2004-12-31	171
2005-03-31	183
2005-06-30	167
2005-09-30	180
2005-12-31	274
2006-03-31	259
2006-06-30	228
2006-09-30	225
2006-12-31	200
2007-03-31	211
2007-06-30	385
2007-09-30	331
2007-12-31	553
2008-03-31	635
2008-06-30	701
2008-09-30	677
2008-12-31	659
2009-03-31	688
2009-06-30	649
2009-09-30	607
2009-12-31	519
2010-03-31	493
2010-06-30	495
2010-09-30	635
2010-12-31	610
2011-03-31	561
2011-06-30	352
2011-09-30	494
2011-12-31	463
2012-03-31	357
2012-06-30	320
2012-09-30	298
2012-12-31	315
2013-03-31	381
2013-06-30	499
2013-09-30	444
2013-12-31	819
2014-03-31	1076
2014-06-30	1159
2014-09-30	1101
2014-12-31	1236
2015-03-31	1145
2015-06-30	1480