Quarter	US dollars
1999-03-31	80
1999-06-30	71
1999-09-30	80
1999-12-31	78
2000-03-31	79
2000-06-30	89
2000-09-30	76
2000-12-31	77
2001-03-31	77
2001-06-30	76
2001-09-30	78
2001-12-31	76
2002-03-31	76
2002-06-30	84
2002-09-30	60
2002-12-31	72
2003-03-31	49
2003-06-30	48
2003-09-30	42
2003-12-31	45
2004-03-31	40
2004-06-30	39
2004-09-30	36
2004-12-31	35
2005-03-31	74
2005-06-30	96
2005-09-30	113
2005-12-31	122
2006-03-31	130
2006-06-30	122
2006-09-30	122
2006-12-31	138
2007-03-31	134
2007-06-30	161
2007-09-30	108
2007-12-31	98
2008-03-31	150
2008-06-30	181
2008-09-30	216
2008-12-31	209
2009-03-31	187
2009-06-30	183
2009-09-30	176
2009-12-31	193
2010-03-31	186
2010-06-30	187
2010-09-30	193
2010-12-31	193
2011-03-31	179
2011-06-30	174
2011-09-30	160
2011-12-31	152
2012-03-31	146
2012-06-30	137
2012-09-30	148
2012-12-31	164
2013-03-31	143
2013-06-30	195
2013-09-30	261
2013-12-31	275
2014-03-31	244
2014-06-30	296
2014-09-30	339
2014-12-31	406
2015-03-31	380
2015-06-30	381
2015-09-30	304
2015-12-31	295
2016-03-31	289
2016-06-30	385
2016-09-30	417
2016-12-31	438
2017-03-31	453
2017-06-30	228
2017-09-30	217
2017-12-31	224
2018-03-31	246
2018-06-30	243
2018-09-30	244
2018-12-31	279
2019-03-31	267
2019-06-30	305
2019-09-30	303
2019-12-31	298
2020-03-31	278
2020-06-30	215
2020-09-30	220
2020-12-31	215
2021-03-31	331
2021-06-30	323
2021-09-30	312
2021-12-31	339
2022-03-31	304
2022-06-30	289
2022-09-30	285
2022-12-31	283
2023-03-31	276
2023-06-30	284
2023-09-30	273