Quarter	US dollars
1999-03-31	1071
1999-06-30	1474
1999-09-30	1274
1999-12-31	1600
2000-03-31	1533
2000-06-30	2123
2000-09-30	1954
2000-12-31	1988
2001-03-31	2726
2001-06-30	3237
2001-09-30	2905
2001-12-31	2583
2002-03-31	2675
2002-06-30	2646
2002-09-30	2774
2002-12-31	2422
2003-03-31	2361
2003-06-30	2821
2003-09-30	2830
2003-12-31	2711
2004-03-31	2576
2004-06-30	2313
2004-09-30	2504
2004-12-31	2027
2005-03-31	2436
2005-06-30	2296
2005-09-30	2655
2005-12-31	2420
2006-03-31	2894
2006-06-30	2268
2006-09-30	2050
2006-12-31	2271
2007-03-31	2100
2007-06-30	2033
2007-09-30	1681
2007-12-31	1622
2008-03-31	1552
2008-06-30	1108
2008-09-30	484
2008-12-31	1294
2009-03-31	992
2009-06-30	1344
2009-09-30	1335
2009-12-31	1290
2010-03-31	2045
2010-06-30	1594
2010-09-30	1033
2010-12-31	1355
2011-03-31	898
2011-06-30	528
2011-09-30	553
2011-12-31	445
2012-03-31	744
2012-06-30	843
2012-09-30	803
2012-12-31	887
2013-03-31	1059
2013-06-30	277
2013-09-30	444
2013-12-31	651
2014-03-31	720
2014-06-30	879
2014-09-30	1138
2014-12-31	375
2015-03-31	406
2015-06-30	409
2015-09-30	457
2015-12-31	550
2016-03-31	407
2016-06-30	1051
2016-09-30	1047
2016-12-31	1163
2017-03-31	823
2017-06-30	981
2017-09-30	793
2017-12-31	1052
2018-03-31	1277
2018-06-30	926
2018-09-30	994
2018-12-31	484
2019-03-31	524
2019-06-30	1045
2019-09-30	517
2019-12-31	1406
2020-03-31	1969
2020-06-30	1661
2020-09-30	1809
2020-12-31	1629
2021-03-31	2999
2021-06-30	2357
2021-09-30	2674
2021-12-31	1785
2022-03-31	3039
2022-06-30	2886
2022-09-30	3308
2022-12-31	3227
2023-03-31	2133
2023-06-30	3280
2023-09-30	3049