Quarter	US dollars
1999-03-31	141317
1999-06-30	175115
1999-09-30	102801
1999-12-31	68293
2000-03-31	94839
2000-06-30	108776
2000-09-30	100505
2000-12-31	92149
2001-03-31	107797
2001-06-30	98549
2001-09-30	97000
2001-12-31	107041
2002-03-31	117662
2002-06-30	118132
2002-09-30	105809
2002-12-31	114378
2003-03-31	107061
2003-06-30	114049
2003-09-30	136609
2003-12-31	156059
2004-03-31	179790
2004-06-30	178383
2004-09-30	168426
2004-12-31	151513
2005-03-31	151446
2005-06-30	133351
2005-09-30	136458
2005-12-31	126281
2006-03-31	138951
2006-06-30	188514
2006-09-30	237641
2006-12-31	230007
2007-03-31	270536
2007-06-30	294501
2007-09-30	326930
2007-12-31	328001
2008-03-31	407886
2008-06-30	325469
2008-09-30	339242
2008-12-31	250119
2009-03-31	318654
2009-06-30	352129
2009-09-30	379598
2009-12-31	358414
2010-03-31	326186
2010-06-30	267990
2010-09-30	305556
2010-12-31	268644
2011-03-31	277106
2011-06-30	248960
2011-09-30	209631
2011-12-31	188426
2012-03-31	212921
2012-06-30	209697
2012-09-30	212286
2012-12-31	214269
2013-03-31	204411
2013-06-30	194160
2013-09-30	205457
2013-12-31	195965
2014-03-31	206857
2014-06-30	204159
2014-09-30	211209
2014-12-31	203929
2015-03-31	202380
2015-06-30	205940
2015-09-30	227702
2015-12-31	184881
2016-03-31	185718
2016-06-30	180732