Quarter	US dollars
1999-03-31	1420
1999-06-30	1153
1999-09-30	1081
1999-12-31	1372
2000-03-31	1057
2000-06-30	1045
2000-09-30	1043
2000-12-31	1110
2001-03-31	1185
2001-06-30	1135
2001-09-30	1336
2001-12-31	1404
2002-03-31	1447
2002-06-30	1533
2002-09-30	1570
2002-12-31	1595
2003-03-31	1826
2003-06-30	2082
2003-09-30	1895
2003-12-31	2064
2004-03-31	1847
2004-06-30	1894
2004-09-30	1983
2004-12-31	2161
2005-03-31	1886
2005-06-30	1820
2005-09-30	2034
2005-12-31	2255
2006-03-31	2399
2006-06-30	2499
2006-09-30	2865
2006-12-31	8899
2007-03-31	2667
2007-06-30	3070
2007-09-30	2835
2007-12-31	3270
2008-03-31	3482
2008-06-30	3385
2008-09-30	3467
2008-12-31	1932
2009-03-31	5466
2009-06-30	1160
2009-09-30	1163
2009-12-31	1184
2010-03-31	1015
2010-06-30	1005
2010-09-30	934
2010-12-31	1352
2011-03-31	1122
2011-06-30	1289
2011-09-30	1295
2011-12-31	1633
2012-03-31	1886
2012-06-30	1857
2012-09-30	2101
2012-12-31	2252
2013-03-31	2278
2013-06-30	2147
2013-09-30	2407
2013-12-31	2453
2014-03-31	2326
2014-06-30	2516
2014-09-30	2136
2014-12-31	2107
2015-03-31	1845
2015-06-30	1651
2015-09-30	1475
2015-12-31	1374
2016-03-31	1154
2016-06-30	1205
2016-09-30	1113
2016-12-31	1081
2017-03-31	1436
2017-06-30	1127
2017-09-30	1098
2017-12-31	1111
2018-03-31	2072
2018-06-30	1016
2018-09-30	985
2018-12-31	972
2019-03-31	1053
2019-06-30	889
2019-09-30	886
2019-12-31	922
2020-03-31	818
2020-06-30	881
2020-09-30	907
2020-12-31	857
2021-03-31	918
2021-06-30	947
2021-09-30	955
2021-12-31	949
2022-03-31	948
2022-06-30	871
2022-09-30	810
2022-12-31	1679
2023-03-31	1370
2023-06-30	1139
2023-09-30	1201