Quarter	US dollars
1999-03-31	298
1999-06-30	482
1999-09-30	429
1999-12-31	675
2000-03-31	565
2000-06-30	542
2000-09-30	304
2000-12-31	942
2001-03-31	1112
2001-06-30	784
2001-09-30	1236
2001-12-31	873
2002-03-31	541
2002-06-30	577
2002-09-30	695
2002-12-31	751
2003-03-31	1041
2003-06-30	793
2003-09-30	840
2003-12-31	880
2004-03-31	844
2004-06-30	747
2004-09-30	918
2004-12-31	1123
2005-03-31	1138
2005-06-30	1300
2005-09-30	1802
2005-12-31	1906
2006-03-31	2595
2006-06-30	2306
2006-09-30	3286
2006-12-31	3353
2007-03-31	2467
2007-06-30	2533
2007-09-30	2985
2007-12-31	4807
2008-03-31	3662
2008-06-30	4256
2008-09-30	3863
2008-12-31	3083
2009-03-31	3371
2009-06-30	4759
2009-09-30	3249
2009-12-31	5157
2010-03-31	3972
2010-06-30	3579
2010-09-30	3494
2010-12-31	6190
2011-03-31	5443
2011-06-30	5638
2011-09-30	7290
2011-12-31	9997
2012-03-31	8487
2012-06-30	8638
2012-09-30	9219
2012-12-31	7485
2013-03-31	7330
2013-06-30	5959
2013-09-30	4050
2013-12-31	4952
2014-03-31	5928
2014-06-30	4973
2014-09-30	4249
2014-12-31	4918
2015-03-31	3903
2015-06-30	5033
2015-09-30	4618
2015-12-31	6627
2016-03-31	6251
2016-06-30	5199
2016-09-30	6641
2016-12-31	7263
2017-03-31	6207
2017-06-30	6280
2017-09-30	5845
2017-12-31	8603
2018-03-31	13739
2018-06-30	13257
2018-09-30	14286
2018-12-31	13560
2019-03-31	13930
2019-06-30	12651
2019-09-30	11636
2019-12-31	14870
2020-03-31	9103
2020-06-30	4951
2020-09-30	7878
2020-12-31	13011
2021-03-31	10480
2021-06-30	12222
2021-09-30	7831
2021-12-31	12672
2022-03-31	9452
2022-06-30	8408
2022-09-30	10056
2022-12-31	11648
2023-03-31	10503
2023-06-30	11363
2023-09-30	9868