Quarter	US dollars
1999-03-31	239
1999-06-30	234
1999-09-30	192
1999-12-31	225
2000-03-31	213
2000-06-30	197
2000-09-30	195
2000-12-31	191
2001-03-31	193
2001-06-30	187
2001-09-30	204
2001-12-31	181
2002-03-31	166
2002-06-30	177
2002-09-30	189
2002-12-31	210
2003-03-31	183
2003-06-30	182
2003-09-30	176
2003-12-31	190
2004-03-31	187
2004-06-30	183
2004-09-30	210
2004-12-31	232
2005-03-31	261
2005-06-30	262
2005-09-30	258
2005-12-31	307
2006-03-31	388
2006-06-30	447
2006-09-30	479
2006-12-31	312
2007-03-31	255
2007-06-30	282
2007-09-30	272
2007-12-31	275
2008-03-31	208
2008-06-30	201
2008-09-30	186
2008-12-31	159
2009-03-31	174
2009-06-30	203
2009-09-30	198
2009-12-31	205
2010-03-31	277
2010-06-30	231
2010-09-30	324
2010-12-31	277
2011-03-31	246
2011-06-30	446
2011-09-30	449
2011-12-31	265
2012-03-31	300
2012-06-30	260
2012-09-30	223
2012-12-31	300
2013-03-31	281
2013-06-30	255
2013-09-30	257
2013-12-31	279
2014-03-31	254
2014-06-30	246
2014-09-30	243
2014-12-31	267
2015-03-31	279
2015-06-30	308
2015-09-30	381
2015-12-31	370
2016-03-31	351
2016-06-30	312
2016-09-30	309
2016-12-31	439
2017-03-31	490
2017-06-30	434
2017-09-30	336
2017-12-31	560
2018-03-31	391
2018-06-30	310
2018-09-30	447
2018-12-31	499
2019-03-31	504
2019-06-30	462
2019-09-30	310
2019-12-31	350
2020-03-31	513
2020-06-30	523
2020-09-30	660
2020-12-31	580
2021-03-31	653
2021-06-30	846
2021-09-30	964
2021-12-31	928
2022-03-31	1219
2022-06-30	1508
2022-09-30	1117
2022-12-31	375
2023-03-31	481
2023-06-30	269
2023-09-30	406