Quarter	US dollars
1999-03-31	2607
1999-06-30	2598
1999-09-30	2680
1999-12-31	2007
2000-03-31	1875
2000-06-30	1751
2000-09-30	2157
2000-12-31	1962
2001-03-31	2038
2001-06-30	1816
2001-09-30	1986
2001-12-31	1755
2002-03-31	2007
2002-06-30	1920
2002-09-30	1934
2002-12-31	1960
2003-03-31	2254
2003-06-30	2414
2003-09-30	2529
2003-12-31	2160
2004-03-31	2622
2004-06-30	2489
2004-09-30	2298
2004-12-31	2614
2005-03-31	2586
2005-06-30	2579
2005-09-30	2558
2005-12-31	2378
2006-03-31	2738
2006-06-30	2643
2006-09-30	3148
2006-12-31	3173
2007-03-31	3415
2007-06-30	3028
2007-09-30	2922
2007-12-31	2703
2008-03-31	2796
2008-06-30	3403
2008-09-30	3121
2008-12-31	2218
2009-03-31	2149
2009-06-30	2226
2009-09-30	2593
2009-12-31	2625
2010-03-31	2855
2010-06-30	3017
2010-09-30	3942
2010-12-31	3160
2011-03-31	3827
2011-06-30	3183
2011-09-30	2982
2011-12-31	3274
2012-03-31	3381
2012-06-30	3701
2012-09-30	3696
2012-12-31	3404
2013-03-31	4062
2013-06-30	4166
2013-09-30	7094
2013-12-31	3922
2014-03-31	4833
2014-06-30	3545
2014-09-30	4717
2014-12-31	4026
2015-03-31	5770
2015-06-30	4940
2015-09-30	6401
2015-12-31	5374
2016-03-31	6840
2016-06-30	4793
2016-09-30	4802
2016-12-31	3734
2017-03-31	5793
2017-06-30	4546
2017-09-30	3894
2017-12-31	3568
2018-03-31	5493
2018-06-30	3836
2018-09-30	4785
2018-12-31	4200
2019-03-31	5574
2019-06-30	4527
2019-09-30	5038
2019-12-31	4683
2020-03-31	5669
2020-06-30	4773
2020-09-30	5221
2020-12-31	5503
2021-03-31	6220
2021-06-30	5693
2021-09-30	6765
2021-12-31	5081
2022-03-31	7342
2022-06-30	5467
2022-09-30	6548
2022-12-31	5046
2023-03-31	7338
2023-06-30	4836
2023-09-30	6136