Quarter	US dollars
1999-03-31	1815
1999-06-30	1924
1999-09-30	2020
1999-12-31	2593
2000-03-31	3716
2000-06-30	3426
2000-09-30	3537
2000-12-31	3271
2001-03-31	3075
2001-06-30	3293
2001-09-30	3274
2001-12-31	3255
2002-03-31	2979
2002-06-30	2988
2002-09-30	3014
2002-12-31	2998
2003-03-31	3077
2003-06-30	3135
2003-09-30	3385
2003-12-31	3343
2004-03-31	3459
2004-06-30	3386
2004-09-30	3485
2004-12-31	3922
2005-03-31	3673
2005-06-30	3395
2005-09-30	3560
2005-12-31	3362
2006-03-31	3425
2006-06-30	3741
2006-09-30	3814
2006-12-31	3483
2007-03-31	3407
2007-06-30	3472
2007-09-30	3569
2007-12-31	3501
2008-03-31	3562
2008-06-30	3256
2008-09-30	3098
2008-12-31	2900
2009-03-31	2904
2009-06-30	2508
2009-09-30	2211
2009-12-31	2099
2010-03-31	2363
2010-06-30	2199
2010-09-30	2345
2010-12-31	2665
2011-03-31	2542
2011-06-30	2608
2011-09-30	2171
2011-12-31	2045
2012-03-31	2012
2012-06-30	1853
2012-09-30	1968
2012-12-31	2133
2013-03-31	2397
2013-06-30	1806
2013-09-30	1808
2013-12-31	1720
2014-03-31	1871
2014-06-30	1779
2014-09-30	1968
2014-12-31	1752
2015-03-31	1844
2015-06-30	1876
2015-09-30	2027
2015-12-31	1904
2016-03-31	1981
2016-06-30	1857
2016-09-30	2007
2016-12-31	1782
2017-03-31	1700
2017-06-30	1689
2017-09-30	1764
2017-12-31	1685
2018-03-31	1678
2018-06-30	1542
2018-09-30	1432
2018-12-31	1397
2019-03-31	1645
2019-06-30	1541
2019-09-30	1523
2019-12-31	1934
2020-03-31	1788
2020-06-30	1347
2020-09-30	1596
2020-12-31	1733
2021-03-31	1466
2021-06-30	1563
2021-09-30	1675
2021-12-31	1776
2022-03-31	1142
2022-06-30	1259
2022-09-30	1194
2022-12-31	730
2023-03-31	1294
2023-06-30	1355
2023-09-30	1283