Quarter	US dollars
1999-03-31	605
1999-06-30	536
1999-09-30	599
1999-12-31	733
2000-03-31	613
2000-06-30	553
2000-09-30	612
2000-12-31	726
2001-03-31	951
2001-06-30	909
2001-09-30	987
2001-12-31	929
2002-03-31	966
2002-06-30	1001
2002-09-30	1083
2002-12-31	1210
2003-03-31	1314
2003-06-30	1342
2003-09-30	1358
2003-12-31	1525
2004-03-31	1476
2004-06-30	1511
2004-09-30	1800
2004-12-31	1803
2005-03-31	2191
2005-06-30	1896
2005-09-30	2049
2005-12-31	2640
2006-03-31	2796
2006-06-30	2428
2006-09-30	3262
2006-12-31	3185
2007-03-31	3660
2007-06-30	2988
2007-09-30	3692
2007-12-31	2585
2008-03-31	2449
2008-06-30	4056
2008-09-30	4412
2008-12-31	3732
2009-03-31	3991
2009-06-30	4026
2009-09-30	3905
2009-12-31	3749
2010-03-31	3780
2010-06-30	3464
2010-09-30	3559
2010-12-31	2990
2011-03-31	6404
2011-06-30	5689
2011-09-30	3835
2011-12-31	3266
2012-03-31	3696
2012-06-30	3690
2012-09-30	3938
2012-12-31	4444
2013-03-31	4228
2013-06-30	3940
2013-09-30	3684
2013-12-31	2694
2014-03-31	3162
2014-06-30	3057
2014-09-30	3403
2014-12-31	3458
2015-03-31	3734
2015-06-30	3659
2015-09-30	3221
2015-12-31	3063
2016-03-31	3465
2016-06-30	3444
2016-09-30	3287
2016-12-31	3088
2017-03-31	3165
2017-06-30	3759
2017-09-30	3305
2017-12-31	2920
2018-03-31	2716
2018-06-30	2937
2018-09-30	2726
2018-12-31	3184
2019-03-31	4138
2019-06-30	5012
2019-09-30	3885
2019-12-31	4111
2020-03-31	4136
2020-06-30	3729
2020-09-30	4188
2020-12-31	4408
2021-03-31	3826
2021-06-30	3901
2021-09-30	3500
2021-12-31	3363
2022-03-31	3127
2022-06-30	3737
2022-09-30	5107
2022-12-31	4217
2023-03-31	5388
2023-06-30	4681
2023-09-30	4691