Quarter	US dollars
1999-03-31	1370779
1999-06-30	1393766
1999-09-30	1403947
1999-12-31	1355231
2000-03-31	1465256
2000-06-30	1501254
2000-09-30	1500130
2000-12-31	1614551
2001-03-31	1687813
2001-06-30	1605150
2001-09-30	1674260
2001-12-31	1700878
2002-03-31	1649722
2002-06-30	1761173
2002-09-30	1775394
2002-12-31	1931441
2003-03-31	2025241
2003-06-30	2185871
2003-09-30	2128773
2003-12-31	2280411
2004-03-31	2526604
2004-06-30	2533515
2004-09-30	2597574
2004-12-31	2756796
2005-03-31	2858084
2005-06-30	2866337
2005-09-30	2922010
2005-12-31	2904610
2006-03-31	3213138
2006-06-30	3351601
2006-09-30	3419909
2006-12-31	3591324
2007-03-31	4096506
2007-06-30	4162402
2007-09-30	4548603
2007-12-31	4836098
2008-03-31	5298031
2008-06-30	4537665
2008-09-30	4419189
2008-12-31	3962549
2009-03-31	3770236
2009-06-30	3788883
2009-09-30	3723170
2009-12-31	3650185
2010-03-31	3529479
2010-06-30	3314814
2010-09-30	3492462
2010-12-31	3391735
2011-03-31	3402969
2011-06-30	3339725
2011-09-30	3652361
2011-12-31	3549393
2012-03-31	3591397
2012-06-30	3277698
2012-09-30	3343280
2012-12-31	3312652
2013-03-31	3115135
2013-06-30	2942139
2013-09-30	2899740
2013-12-31	2949493
2014-03-31	2921770
2014-06-30	2973043
2014-09-30	2843602
2014-12-31	2749220
2015-03-31	2629299
2015-06-30	2563550
2015-09-30	2508241
2015-12-31	2476586
2016-03-31	2473283
2016-06-30	2434969