Quarter	US dollars
1999-03-31	1271560
1999-06-30	1261214
1999-09-30	1260200
1999-12-31	1188868
2000-03-31	1273184
2000-06-30	1307179
2000-09-30	1265728
2000-12-31	1350399
2001-03-31	1401510
2001-06-30	1310428
2001-09-30	1365584
2001-12-31	1366500
2002-03-31	1304326
2002-06-30	1345393
2002-09-30	1388385
2002-12-31	1538039
2003-03-31	1563280
2003-06-30	1709686
2003-09-30	1656331
2003-12-31	1848852
2004-03-31	2043031
2004-06-30	2046295
2004-09-30	2051508
2004-12-31	2149054
2005-03-31	2249679
2005-06-30	2258930
2005-09-30	2249789
2005-12-31	2270446
2006-03-31	2498036
2006-06-30	2633449
2006-09-30	2681590
2006-12-31	2692939
2007-03-31	3067814
2007-06-30	3154693
2007-09-30	3421108
2007-12-31	3617806
2008-03-31	4062233
2008-06-30	3651171
2008-09-30	3473258
2008-12-31	3215325
2009-03-31	3124981
2009-06-30	3198927
2009-09-30	3103837
2009-12-31	3101183
2010-03-31	3070648
2010-06-30	3026451
2010-09-30	3235615
2010-12-31	3009552
2011-03-31	3115348
2011-06-30	3104960
2011-09-30	3407380
2011-12-31	3242643
2012-03-31	3344803
2012-06-30	3103465
2012-09-30	3088579
2012-12-31	3014824
2013-03-31	2898846
2013-06-30	2814841
2013-09-30	2768795
2013-12-31	2694927
2014-03-31	2745478
2014-06-30	2733889
2014-09-30	2653342
2014-12-31	2540814
2015-03-31	2415404
2015-06-30	2438727
2015-09-30	2366518
2015-12-31	2351242
2016-03-31	2313798
2016-06-30	2415785