Quarter	US dollars
1999-03-31	187484
1999-06-30	184483
1999-09-30	190184
1999-12-31	176084
2000-03-31	195642
2000-06-30	190869
2000-09-30	202905
2000-12-31	219278
2001-03-31	232874
2001-06-30	227723
2001-09-30	247121
2001-12-31	241590
2002-03-31	240064
2002-06-30	309184
2002-09-30	316074
2002-12-31	335775
2003-03-31	388116
2003-06-30	415874
2003-09-30	413043
2003-12-31	422815
2004-03-31	441543
2004-06-30	450661
2004-09-30	485827
2004-12-31	515274
2005-03-31	504955
2005-06-30	531002
2005-09-30	537722
2005-12-31	497979
2006-03-31	517527
2006-06-30	552040
2006-09-30	585974
2006-12-31	647074
2007-03-31	708954
2007-06-30	777969
2007-09-30	868076
2007-12-31	926149
2008-03-31	1015589
2008-06-30	946202
2008-09-30	855735
2008-12-31	795284
2009-03-31	795770
2009-06-30	800525
2009-09-30	839418
2009-12-31	730731
2010-03-31	709446
2010-06-30	679437
2010-09-30	769939
2010-12-31	733611
2011-03-31	804532
2011-06-30	865400
2011-09-30	872104
2011-12-31	808639
2012-03-31	836740
2012-06-30	816898
2012-09-30	795511
2012-12-31	797781
2013-03-31	760754
2013-06-30	738446
2013-09-30	698896
2013-12-31	681629
2014-03-31	712167
2014-06-30	726433
2014-09-30	679374
2014-12-31	675395
2015-03-31	660558
2015-06-30	598721
2015-09-30	603140
2015-12-31	553279