Quarter	US dollars
1999-03-31	858
1999-06-30	1044
1999-09-30	1178
1999-12-31	1331
2000-03-31	1488
2000-06-30	1442
2000-09-30	1580
2000-12-31	1788
2001-03-31	1569
2001-06-30	1622
2001-09-30	1939
2001-12-31	1973
2002-03-31	1736
2002-06-30	1436
2002-09-30	1549
2002-12-31	2061
2003-03-31	1962
2003-06-30	1739
2003-09-30	2240
2003-12-31	2306
2004-03-31	2468
2004-06-30	2567
2004-09-30	2839
2004-12-31	2401
2005-03-31	2318
2005-06-30	2963
2005-09-30	2752
2005-12-31	2285
2006-03-31	2389
2006-06-30	2114
2006-09-30	1491
2006-12-31	1893
2007-03-31	2645
2007-06-30	3540
2007-09-30	4151
2007-12-31	3946
2008-03-31	4722
2008-06-30	4309
2008-09-30	4855
2008-12-31	4234
2009-03-31	3972
2009-06-30	4108
2009-09-30	4679
2009-12-31	5363
2010-03-31	4100
2010-06-30	4302
2010-09-30	4548
2010-12-31	4114
2011-03-31	3351
2011-06-30	3302
2011-09-30	4176
2011-12-31	3047
2012-03-31	3074
2012-06-30	3632
2012-09-30	3384
2012-12-31	3001
2013-03-31	3377
2013-06-30	2780
2013-09-30	2487
2013-12-31	2941
2014-03-31	2816
2014-06-30	2237
2014-09-30	2333
2014-12-31	2504
2015-03-31	3238
2015-06-30	3072
2015-09-30	3172
2015-12-31	2746
2016-03-31	2616
2016-06-30	2920
2016-09-30	3078
2016-12-31	2506
2017-03-31	2428
2017-06-30	2697
2017-09-30	2921
2017-12-31	2724
2018-03-31	2301
2018-06-30	2139
2018-09-30	1611
2018-12-31	1781
2019-03-31	1653
2019-06-30	1824
2019-09-30	2175
2019-12-31	1920
2020-03-31	1624
2020-06-30	1500
2020-09-30	1719
2020-12-31	1683
2021-03-31	1463
2021-06-30	1175
2021-09-30	1274
2021-12-31	1210
2022-03-31	1143
2022-06-30	1297
2022-09-30	1384
2022-12-31	1466
2023-03-31	1799
2023-06-30	1996
2023-09-30	2422