Quarter	US dollars
1999-03-31	2041
1999-06-30	1609
1999-09-30	1615
1999-12-31	1549
2000-03-31	1783
2000-06-30	1389
2000-09-30	1585
2000-12-31	1299
2001-03-31	1124
2001-06-30	1502
2001-09-30	1812
2001-12-31	1627
2002-03-31	1147
2002-06-30	1740
2002-09-30	1687
2002-12-31	1868
2003-03-31	2187
2003-06-30	1645
2003-09-30	1519
2003-12-31	1807
2004-03-31	1876
2004-06-30	1842
2004-09-30	2090
2004-12-31	1978
2005-03-31	2006
2005-06-30	1588
2005-09-30	1486
2005-12-31	1870
2006-03-31	1755
2006-06-30	1892
2006-09-30	1816
2006-12-31	1965
2007-03-31	2419
2007-06-30	2577
2007-09-30	2841
2007-12-31	3946
2008-03-31	3342
2008-06-30	2428
2008-09-30	2394
2008-12-31	1736
2009-03-31	1582
2009-06-30	1257
2009-09-30	1009
2009-12-31	1212
2010-03-31	1250
2010-06-30	2035
2010-09-30	1270
2010-12-31	1289
2011-03-31	1807
2011-06-30	1330
2011-09-30	1214
2011-12-31	1159
2012-03-31	1600
2012-06-30	1816
2012-09-30	1226
2012-12-31	943
2013-03-31	1071
2013-06-30	1231
2013-09-30	976
2013-12-31	965
2014-03-31	876
2014-06-30	709
2014-09-30	756
2014-12-31	881
2015-03-31	734
2015-06-30	772
2015-09-30	796
2015-12-31	1129
2016-03-31	1152
2016-06-30	741
2016-09-30	694
2016-12-31	609
2017-03-31	734
2017-06-30	607
2017-09-30	646
2017-12-31	637
2018-03-31	550
2018-06-30	525
2018-09-30	634
2018-12-31	428
2019-03-31	556
2019-06-30	659
2019-09-30	682
2019-12-31	694
2020-03-31	907
2020-06-30	1021
2020-09-30	1144
2020-12-31	1723
2021-03-31	1544
2021-06-30	1362
2021-09-30	1865
2021-12-31	2000
2022-03-31	2415
2022-06-30	2786
2022-09-30	3028
2022-12-31	2646
2023-03-31	2585
2023-06-30	2008
2023-09-30	1979