Quarter	US dollars
1999-03-31	1714
1999-06-30	1561
1999-09-30	1769
1999-12-31	1609
2000-03-31	1622
2000-06-30	1568
2000-09-30	1733
2000-12-31	1853
2001-03-31	1224
2001-06-30	1447
2001-09-30	1280
2001-12-31	1140
2002-03-31	1328
2002-06-30	1547
2002-09-30	1994
2002-12-31	1809
2003-03-31	1419
2003-06-30	1190
2003-09-30	1247
2003-12-31	1441
2004-03-31	1976
2004-06-30	1650
2004-09-30	1763
2004-12-31	1974
2005-03-31	1790
2005-06-30	2009
2005-09-30	2229
2005-12-31	2070
2006-03-31	2052
2006-06-30	2206
2006-09-30	2176
2006-12-31	3304
2007-03-31	3011
2007-06-30	3405
2007-09-30	3210
2007-12-31	2992
2008-03-31	3053
2008-06-30	2901
2008-09-30	3267
2008-12-31	2877
2009-03-31	1806
2009-06-30	2005
2009-09-30	1837
2009-12-31	2158
2010-03-31	2425
2010-06-30	2717
2010-09-30	3091
2010-12-31	1920
2011-03-31	2039
2011-06-30	2535
2011-09-30	1415
2011-12-31	2778
2012-03-31	1137
2012-06-30	2413
2012-09-30	1364
2012-12-31	676
2013-03-31	1124
2013-06-30	968
2013-09-30	1337
2013-12-31	1004
2014-03-31	1867
2014-06-30	1616
2014-09-30	1874
2014-12-31	1616
2015-03-31	1832
2015-06-30	1695
2015-09-30	924
2015-12-31	644
2016-03-31	526
2016-06-30	717
2016-09-30	542
2016-12-31	479
2017-03-31	537
2017-06-30	578
2017-09-30	689
2017-12-31	1006
2018-03-31	706
2018-06-30	705
2018-09-30	819
2018-12-31	909
2019-03-31	894
2019-06-30	836
2019-09-30	939
2019-12-31	985
2020-03-31	1188
2020-06-30	759
2020-09-30	476
2020-12-31	322
2021-03-31	251
2021-06-30	467
2021-09-30	300
2021-12-31	186
2022-03-31	285
2022-06-30	338
2022-09-30	233
2022-12-31	255
2023-03-31	309
2023-06-30	558
2023-09-30	666