Quarter	US dollars
1999-03-31	550
1999-06-30	528
1999-09-30	520
1999-12-31	500
2000-03-31	473
2000-06-30	428
2000-09-30	416
2000-12-31	422
2001-03-31	391
2001-06-30	369
2001-09-30	342
2001-12-31	333
2002-03-31	320
2002-06-30	441
2002-09-30	436
2002-12-31	436
2003-03-31	365
2003-06-30	380
2003-09-30	385
2003-12-31	354
2004-03-31	380
2004-06-30	352
2004-09-30	348
2004-12-31	399
2005-03-31	371
2005-06-30	378
2005-09-30	319
2005-12-31	1025
2006-03-31	1087
2006-06-30	971
2006-09-30	1086
2006-12-31	612
2007-03-31	1298
2007-06-30	1831
2007-09-30	5133
2007-12-31	5496
2008-03-31	6379
2008-06-30	6541
2008-09-30	6166
2008-12-31	7217
2009-03-31	6526
2009-06-30	6668
2009-09-30	6696
2009-12-31	6986
2010-03-31	6643
2010-06-30	3895
2010-09-30	4291
2010-12-31	2960
2011-03-31	3071
2011-06-30	2989
2011-09-30	1584
2011-12-31	1781
2012-03-31	2341
2012-06-30	1029
2012-09-30	963
2012-12-31	2302
2013-03-31	2600
2013-06-30	2667
2013-09-30	3978
2013-12-31	2085
2014-03-31	1105
2014-06-30	1027
2014-09-30	1082
2014-12-31	1036
2015-03-31	1291
2015-06-30	867
2015-09-30	893
2015-12-31	992
2016-03-31	1079
2016-06-30	1148
2016-09-30	942
2016-12-31	981
2017-03-31	1183
2017-06-30	1262
2017-09-30	1137
2017-12-31	1046
2018-03-31	1078
2018-06-30	1206
2018-09-30	1335
2018-12-31	1352
2019-03-31	1242
2019-06-30	1282
2019-09-30	1075
2019-12-31	1489
2020-03-31	1913
2020-06-30	2008
2020-09-30	1927
2020-12-31	2302
2021-03-31	2352
2021-06-30	2256
2021-09-30	1936
2021-12-31	2006
2022-03-31	1652
2022-06-30	1665
2022-09-30	1408
2022-12-31	1348
2023-03-31	1197
2023-06-30	1222
2023-09-30	1140