Quarter	US dollars
2004-12-31	14505
2005-03-31	17373
2005-06-30	15405
2005-09-30	26355
2005-12-31	21296
2006-03-31	22862
2006-06-30	29601
2006-09-30	33299
2006-12-31	36866
2007-03-31	40493
2007-06-30	41378
2007-09-30	61768
2007-12-31	58212
2008-03-31	61446
2008-06-30	60268
2008-09-30	55721
2008-12-31	52521
2009-03-31	41689
2009-06-30	42191
2009-09-30	50920
2009-12-31	53763
2010-03-31	67267
2010-06-30	76752
2010-09-30	86260
2010-12-31	104627
2011-03-31	115576
2011-06-30	151220
2011-09-30	154215
2011-12-31	152244
2012-03-31	157689
2012-06-30	155718
2012-09-30	144504
2012-12-31	145611
2013-03-31	171233
2013-06-30	183712
2013-09-30	193002
2013-12-31	200007
2014-03-31	221189
2014-06-30	210228
2014-09-30	202146
2014-12-31	197994
2015-03-31	193173
2015-06-30	186212
2015-09-30	169245
2015-12-31	157886
2016-03-31	150755
2016-06-30	151733
2016-09-30	150803
2016-12-31	155921
2017-03-31	160245
2017-06-30	196049
2017-09-30	195223
2017-12-31	209300
2018-03-31	202646
2018-06-30	197080
2018-09-30	194958
2018-12-31	197676
2019-03-31	205600
2019-06-30	214849
2019-09-30	206673