Quarterly US dollars
1986-09-30 6
1986-12-31 6
1987-03-31 6
1987-06-30 26
1987-09-30 21
1987-12-31 63
1988-03-31 38
1988-06-30 14
1988-09-30 75
1988-12-31 13
1989-03-31 20
1989-06-30 12
1989-09-30 30
1989-12-31 40
1990-03-31 25
1990-06-30 21
1990-09-30 34
1990-12-31 43
1991-03-31 50
1991-06-30 36
1991-09-30 29
1991-12-31 47
1992-03-31 32
1992-06-30 40
1992-09-30 45
1992-12-31 28
1993-03-31 16
1993-06-30 10
1993-09-30 44
1993-12-31 52
1994-03-31 32
1994-06-30 40
1994-09-30 48
1994-12-31 55
1995-03-31 115
1995-06-30 142
1995-09-30 123
1995-12-31 133
1996-03-31 117
1996-06-30 67
1996-09-30 88
1996-12-31 193
1997-03-31 453
1997-06-30 389
1997-09-30 343
1997-12-31 152
1998-03-31 126
1998-06-30 89
1998-09-30 105
1998-12-31 13
1999-03-31 74
1999-06-30 47
1999-09-30 15
1999-12-31 33
2000-03-31 65
2000-06-30 32
2000-09-30 128
2000-12-31 147
2001-03-31 133
2001-06-30 180
2001-09-30 136
2001-12-31 5
2002-03-31 21
2002-06-30 3
2002-09-30 0
2002-12-31 2
2003-03-31 1
2003-06-30 1
2003-09-30 2
2003-12-31 2
2004-03-31 2
2004-06-30 2
2004-09-30 2
2004-12-31 1
2005-03-31 11
2005-06-30 39
2005-09-30 142
2005-12-31 153
2006-03-31 220
2006-06-30 208
2006-09-30 208
2006-12-31 179
2007-03-31 188
2007-06-30 256
2007-09-30 244
2007-12-31 122
2008-03-31 93
2008-06-30 89
2008-09-30 33
2008-12-31 4
2009-03-31 5
2009-06-30 6
2009-09-30 6
2009-12-31 6
2010-03-31 5
2010-06-30 10
2010-09-30 16
2010-12-31 7
2011-03-31 15
2011-06-30 158
2011-09-30 82
2011-12-31 70
2012-03-31 81
2012-06-30 159
2012-09-30 63
2012-12-31 22
2013-03-31 11
2013-06-30 11
2013-09-30 19
2013-12-31 92
2014-03-31 97
2014-06-30 74
2014-09-30 77
2014-12-31 78
2015-03-31 13
2015-06-30 12
2015-09-30 10
2015-12-31 10
2016-03-31 24
2016-06-30 9
2016-09-30 8
2016-12-31 8
2017-03-31 10
2017-06-30 12
2017-09-30 32
2017-12-31 126
2018-03-31 89
2018-06-30 86
2018-09-30 73
2018-12-31 4
2019-03-31 68
2019-06-30 62
2019-09-30 3
2019-12-31 3
2020-03-31 9
2020-06-30 45
2020-09-30 77
2020-12-31 4
2021-03-31 52
2021-06-30 53
2021-09-30 19
2021-12-31 22
2022-03-31 27
2022-06-30 20
2022-09-30 15
2022-12-31 27
2023-03-31 15
2023-06-30 15
2023-09-30 19