Quarter	US dollars
1999-09-30	1558
1999-12-31	2007
2000-03-31	1546
2000-06-30	1927
2000-09-30	1972
2000-12-31	2456
2001-03-31	3539
2001-06-30	2699
2001-09-30	3237
2001-12-31	4215
2002-03-31	3300
2002-06-30	5885
2002-09-30	4263
2002-12-31	4619
2003-03-31	4874
2003-06-30	4959
2003-09-30	5732
2003-12-31	6274
2004-03-31	6186
2004-06-30	4957
2004-09-30	4686
2004-12-31	7461
2005-03-31	7100
2005-06-30	8989
2005-09-30	11133
2005-12-31	12981
2006-03-31	11873
2006-06-30	17050
2006-09-30	15293
2006-12-31	12490
2007-03-31	22012
2007-06-30	26286
2007-09-30	30109
2007-12-31	34578
2008-03-31	57866
2008-06-30	70760
2008-09-30	76281
2008-12-31	92259
2009-03-31	81126
2009-06-30	64693
2009-09-30	52930
2009-12-31	47141
2010-03-31	49989
2010-06-30	55479
2010-09-30	56954
2010-12-31	57170
2011-03-31	47532
2011-06-30	58956
2011-09-30	64913
2011-12-31	59950
2012-03-31	49325
2012-06-30	53025
2012-09-30	43772
2012-12-31	37343
2013-03-31	36967
2013-06-30	40191
2013-09-30	42817
2013-12-31	43285
2014-03-31	37197
2014-06-30	36747
2014-09-30	36691
2014-12-31	42231
2015-03-31	44382
2015-06-30	36933
2015-09-30	44664
2015-12-31	36939
2016-03-31	37705
2016-06-30	37611
2016-09-30	30834
2016-12-31	29488
2017-03-31	26326
2017-06-30	21100
2017-09-30	19345
2017-12-31	20632
2018-03-31	20699
2018-06-30	19632
2018-09-30	20272
2018-12-31	19798
2019-03-31	18569
2019-06-30	21093
2019-09-30	32371
2019-12-31	25937
2020-03-31	52275
2020-06-30	44877
2020-09-30	42299
2020-12-31	37854
2021-03-31	28493
2021-06-30	25679
2021-09-30	24157
2021-12-31	22197
2022-03-31	23713
2022-06-30	34719
2022-09-30	49800
2022-12-31	32555
2023-03-31	25461
2023-06-30	31966
2023-09-30	33534