Quarter	US dollars
1999-03-31	361966
1999-06-30	335497
1999-09-30	376314
1999-12-31	365516
2000-03-31	390874
2000-06-30	401175
2000-09-30	367339
2000-12-31	417341
2001-03-31	496020
2001-06-30	455208
2001-09-30	466396
2001-12-31	434993
2002-03-31	422675
2002-06-30	455800
2002-09-30	498972
2002-12-31	557074
2003-03-31	628444
2003-06-30	686896
2003-09-30	700848
2003-12-31	778611
2004-03-31	824511
2004-06-30	831484
2004-09-30	880383
2004-12-31	940704
2005-03-31	998430
2005-06-30	973923
2005-09-30	985423
2005-12-31	965568
2006-03-31	1086484
2006-06-30	1157689
2006-09-30	1154219
2006-12-31	1142287
2007-03-31	1304521
2007-06-30	1355641
2007-09-30	1443407
2007-12-31	1537157
2008-03-31	1747712
2008-06-30	1618786
2008-09-30	1478669
2008-12-31	1362016
2009-03-31	1244968
2009-06-30	1377801
2009-09-30	1362958
2009-12-31	1357232
2010-03-31	1352920
2010-06-30	1315301
2010-09-30	1429692
2010-12-31	1269743
2011-03-31	1308247
2011-06-30	1287856
2011-09-30	1307534
2011-12-31	1252109
2012-03-31	1414230
2012-06-30	1351859
2012-09-30	1315545
2012-12-31	1268444
2013-03-31	1186697
2013-06-30	1126233
2013-09-30	1051236
2013-12-31	1005483
2014-03-31	1015540
2014-06-30	939388
2014-09-30	861647
2014-12-31	805184
2015-03-31	779474
2015-06-30	814342
2015-09-30	802211
2015-12-31	770439