Quarter	US dollars
1999-03-31	645
1999-06-30	641
1999-09-30	606
1999-12-31	475
2000-03-31	596
2000-06-30	705
2000-09-30	780
2000-12-31	1015
2001-03-31	1215
2001-06-30	1208
2001-09-30	1254
2001-12-31	1388
2002-03-31	1490
2002-06-30	1775
2002-09-30	1706
2002-12-31	1860
2003-03-31	1781
2003-06-30	2387
2003-09-30	2035
2003-12-31	2023
2004-03-31	2277
2004-06-30	2424
2004-09-30	2762
2004-12-31	2900
2005-03-31	2885
2005-06-30	3016
2005-09-30	3128
2005-12-31	2612
2006-03-31	2862
2006-06-30	3007
2006-09-30	3178
2006-12-31	3439
2007-03-31	3347
2007-06-30	3314
2007-09-30	2802
2007-12-31	2905
2008-03-31	3247
2008-06-30	2721
2008-09-30	1622
2008-12-31	1563
2009-03-31	1518
2009-06-30	1488
2009-09-30	1314
2009-12-31	1351
2010-03-31	1251
2010-06-30	1221
2010-09-30	1260
2010-12-31	1239
2011-03-31	1073
2011-06-30	1497
2011-09-30	785
2011-12-31	906
2012-03-31	1081
2012-06-30	927
2012-09-30	803
2012-12-31	881
2013-03-31	776
2013-06-30	703
2013-09-30	787
2013-12-31	776
2014-03-31	765
2014-06-30	986
2014-09-30	858
2014-12-31	760
2015-03-31	667
2015-06-30	543
2015-09-30	1669
2015-12-31	2065
2016-03-31	2224
2016-06-30	1449
2016-09-30	876
2016-12-31	1427
2017-03-31	1138
2017-06-30	793
2017-09-30	784
2017-12-31	788
2018-03-31	881
2018-06-30	959
2018-09-30	924
2018-12-31	732
2019-03-31	824
2019-06-30	862
2019-09-30	838
2019-12-31	862
2020-03-31	610
2020-06-30	730
2020-09-30	607
2020-12-31	655
2021-03-31	668
2021-06-30	814
2021-09-30	651
2021-12-31	736
2022-03-31	855
2022-06-30	854
2022-09-30	730
2022-12-31	760
2023-03-31	497
2023-06-30	477
2023-09-30	332