Quarter	US dollars
1999-03-31	1134
1999-06-30	1082
1999-09-30	1152
1999-12-31	1192
2000-03-31	1150
2000-06-30	1176
2000-09-30	1125
2000-12-31	1469
2001-03-31	1296
2001-06-30	987
2001-09-30	1214
2001-12-31	1085
2002-03-31	1079
2002-06-30	1843
2002-09-30	2094
2002-12-31	2255
2003-03-31	2066
2003-06-30	2054
2003-09-30	1603
2003-12-31	1842
2004-03-31	1647
2004-06-30	1525
2004-09-30	1599
2004-12-31	2066
2005-03-31	1768
2005-06-30	1776
2005-09-30	1845
2005-12-31	1758
2006-03-31	1888
2006-06-30	2564
2006-09-30	1799
2006-12-31	2615
2007-03-31	2181
2007-06-30	2727
2007-09-30	3040
2007-12-31	5676
2008-03-31	5528
2008-06-30	5326
2008-09-30	4532
2008-12-31	3372
2009-03-31	2591
2009-06-30	2849
2009-09-30	2904
2009-12-31	2690
2010-03-31	3132
2010-06-30	2528
2010-09-30	3264
2010-12-31	3266
2011-03-31	3487
2011-06-30	3845
2011-09-30	4360
2011-12-31	3791
2012-03-31	3148
2012-06-30	2998
2012-09-30	2355
2012-12-31	3148
2013-03-31	2575
2013-06-30	2899
2013-09-30	3231
2013-12-31	3531
2014-03-31	2851
2014-06-30	2879
2014-09-30	2706
2014-12-31	2717
2015-03-31	2533
2015-06-30	2460
2015-09-30	2513
2015-12-31	2778
2016-03-31	2883
2016-06-30	2774
2016-09-30	2475
2016-12-31	2345
2017-03-31	2118
2017-06-30	2038
2017-09-30	1995
2017-12-31	2129
2018-03-31	2229
2018-06-30	2155
2018-09-30	2029
2018-12-31	1829
2019-03-31	1768
2019-06-30	1543
2019-09-30	1287
2019-12-31	1300
2020-03-31	1208
2020-06-30	1218
2020-09-30	1262
2020-12-31	1386
2021-03-31	1332
2021-06-30	1079
2021-09-30	1148
2021-12-31	1008
2022-03-31	1038
2022-06-30	1168
2022-09-30	1027
2022-12-31	1304
2023-03-31	1440
2023-06-30	1463
2023-09-30	1480