Quarter	US dollars
1999-03-31	1384
1999-06-30	1624
1999-09-30	1910
1999-12-31	2104
2000-03-31	2436
2000-06-30	2031
2000-09-30	1813
2000-12-31	1731
2001-03-31	1942
2001-06-30	3094
2001-09-30	3563
2001-12-31	2295
2002-03-31	1756
2002-06-30	2613
2002-09-30	2139
2002-12-31	1739
2003-03-31	1112
2003-06-30	1565
2003-09-30	1219
2003-12-31	1862
2004-03-31	2340
2004-06-30	3072
2004-09-30	3494
2004-12-31	3624
2005-03-31	2334
2005-06-30	3028
2005-09-30	5307
2005-12-31	5116
2006-03-31	2394
2006-06-30	4584
2006-09-30	6047
2006-12-31	6437
2007-03-31	6333
2007-06-30	4625
2007-09-30	4636
2007-12-31	7097
2008-03-31	7663
2008-06-30	6369
2008-09-30	4322
2008-12-31	4809
2009-03-31	4853
2009-06-30	5427
2009-09-30	4335
2009-12-31	3962
2010-03-31	3248
2010-06-30	2814
2010-09-30	3178
2010-12-31	1763
2011-03-31	2668
2011-06-30	1761
2011-09-30	2567
2011-12-31	3366
2012-03-31	2076
2012-06-30	1699
2012-09-30	3049
2012-12-31	2989
2013-03-31	3222
2013-06-30	3567
2013-09-30	3447
2013-12-31	2675
2014-03-31	4939
2014-06-30	3797
2014-09-30	5733
2014-12-31	3872
2015-03-31	3892
2015-06-30	3382
2015-09-30	2931
2015-12-31	3640
2016-03-31	5442
2016-06-30	4003
2016-09-30	3976
2016-12-31	4933
2017-03-31	2803
2017-06-30	3154
2017-09-30	2621
2017-12-31	3027
2018-03-31	3136
2018-06-30	4476
2018-09-30	9786
2018-12-31	7476
2019-03-31	7677
2019-06-30	5750
2019-09-30	6708
2019-12-31	6988
2020-03-31	8238
2020-06-30	5853
2020-09-30	6646
2020-12-31	7526
2021-03-31	5596
2021-06-30	6061
2021-09-30	6495
2021-12-31	7954
2022-03-31	6621
2022-06-30	9027
2022-09-30	10152
2022-12-31	6217
2023-03-31	6022
2023-06-30	5312
2023-09-30	4806