Quarterly US dollars
1986-09-30 1
1986-12-31 3
1987-03-31 2
1987-06-30 2
1987-09-30 2
1987-12-31 1
1988-03-31 1
1988-06-30 1
1988-09-30 1
1988-12-31 2
1989-03-31 11
1989-06-30 69
1989-09-30 82
1989-12-31 59
1990-03-31 80
1990-06-30 38
1990-09-30 134
1990-12-31 158
1991-03-31 1
1991-06-30 2
1991-09-30 4
1991-12-31 4
1992-03-31 4
1992-06-30 5
1992-09-30 7
1992-12-31 6
1993-03-31 8
1993-06-30 29
1993-09-30 30
1993-12-31 39
1994-03-31 41
1994-06-30 40
1994-09-30 42
1994-12-31 40
1995-03-31 46
1995-06-30 71
1995-09-30 59
1995-12-31 59
1996-03-31 52
1996-06-30 47
1996-09-30 64
1996-12-31 69
1997-03-31 49
1997-06-30 40
1997-09-30 44
1997-12-31 59
1998-03-31 61
1998-06-30 48
1998-09-30 52
1998-12-31 56
1999-03-31 79
1999-06-30 50
1999-09-30 69
1999-12-31 68
2000-03-31 59
2000-06-30 72
2000-09-30 63
2000-12-31 87
2001-03-31 111
2001-06-30 72
2001-09-30 100
2001-12-31 98
2002-03-31 78
2002-06-30 64
2002-09-30 80
2002-12-31 73
2003-03-31 62
2003-06-30 68
2003-09-30 73
2003-12-31 72
2004-03-31 91
2004-06-30 80
2004-09-30 140
2004-12-31 125
2005-03-31 116
2005-06-30 96
2005-09-30 111
2005-12-31 65
2006-03-31 100
2006-06-30 296
2006-09-30 223
2006-12-31 255
2007-03-31 198
2007-06-30 208
2007-09-30 226
2007-12-31 263
2008-03-31 331
2008-06-30 354
2008-09-30 216
2008-12-31 87
2009-03-31 99
2009-06-30 122
2009-09-30 114
2009-12-31 106
2010-03-31 98
2010-06-30 101
2010-09-30 72
2010-12-31 74
2011-03-31 59
2011-06-30 58
2011-09-30 56
2011-12-31 90
2012-03-31 65
2012-06-30 79
2012-09-30 82
2012-12-31 108
2013-03-31 135
2013-06-30 133
2013-09-30 79
2013-12-31 115
2014-03-31 97
2014-06-30 101
2014-09-30 76
2014-12-31 101
2015-03-31 146
2015-06-30 164
2015-09-30 84
2015-12-31 88
2016-03-31 279
2016-06-30 125
2016-09-30 129
2016-12-31 315
2017-03-31 281
2017-06-30 476
2017-09-30 534
2017-12-31 479
2018-03-31 260
2018-06-30 125
2018-09-30 283
2018-12-31 215
2019-03-31 156
2019-06-30 131
2019-09-30 214
2019-12-31 262
2020-03-31 181
2020-06-30 258
2020-09-30 131
2020-12-31 194
2021-03-31 193
2021-06-30 157
2021-09-30 173
2021-12-31 202
2022-03-31 141
2022-06-30 178
2022-09-30 164
2022-12-31 218
2023-03-31 222
2023-06-30 462
2023-09-30 478