Quarterly US dollars
1986-09-30 0
1986-12-31 3
1987-03-31 0
1987-06-30 0
1987-09-30 1
1987-12-31 0
1988-03-31 0
1988-06-30 1
1988-09-30 0
1988-12-31 0
1989-03-31 0
1989-06-30 0
1989-09-30 0
1989-12-31 0
1990-03-31 0
1990-06-30 0
1990-09-30 0
1990-12-31 0
1991-03-31 0
1991-06-30 1
1991-09-30 0
1991-12-31 0
1992-03-31 0
1992-06-30 0
1992-09-30 0
1992-12-31 0
1993-03-31 1
1993-06-30 0
1993-09-30 0
1993-12-31 0
1994-03-31 2
1994-06-30 0
1994-09-30 0
1994-12-31 0
1995-03-31 0
1995-06-30 0
1995-09-30 0
1995-12-31 0
1996-03-31 0
1996-06-30 0
1996-09-30 0
1996-12-31 0
1997-03-31 0
1997-06-30 6
1997-09-30 46
1997-12-31 0
1998-03-31 0
1998-06-30 1
1998-09-30 0
1998-12-31 0
1999-03-31 0
1999-06-30 1
1999-09-30 1
1999-12-31 0
2000-03-31 0
2000-06-30 0
2000-09-30 0
2000-12-31 0
2001-03-31 0
2001-06-30 0
2001-09-30 0
2001-12-31 0
2002-03-31 0
2002-06-30 0
2002-09-30 0
2002-12-31 0
2003-03-31 0
2003-06-30 1
2003-09-30 6
2003-12-31 6
2004-03-31 6
2004-06-30 6
2004-09-30 7
2004-12-31 41
2005-03-31 6
2005-06-30 8
2005-09-30 8
2005-12-31 25
2006-03-31 24
2006-06-30 21
2006-09-30 33
2006-12-31 19
2007-03-31 16
2007-06-30 14
2007-09-30 15
2007-12-31 15
2008-03-31 28
2008-06-30 20
2008-09-30 20
2008-12-31 18
2009-03-31 22
2009-06-30 23
2009-09-30 20
2009-12-31 15
2010-03-31 19
2010-06-30 20
2010-09-30 20
2010-12-31 15
2011-03-31 19
2011-06-30 16
2011-09-30 14
2011-12-31 11
2012-03-31 17
2012-06-30 14
2012-09-30 5
2012-12-31 16
2013-03-31 12
2013-06-30 12
2013-09-30 12
2013-12-31 130
2014-03-31 14
2014-06-30 8
2014-09-30 7
2014-12-31 7
2015-03-31 7
2015-06-30 6
2015-09-30 6
2015-12-31 5
2016-03-31 5
2016-06-30 4
2016-09-30 4
2016-12-31 4
2017-03-31 3
2017-06-30 7
2017-09-30 6
2017-12-31 7
2018-03-31 6
2018-06-30 5
2018-09-30 5
2018-12-31 4
2019-03-31 3
2019-06-30 3
2019-09-30 3
2019-12-31 3
2020-03-31 3
2020-06-30 3
2020-09-30 2
2020-12-31 2
2021-03-31 2
2021-06-30 1
2021-09-30 1
2021-12-31 1
2022-03-31 1
2022-06-30 1
2022-09-30 1
2022-12-31 1
2023-03-31 1
2023-06-30 1
2023-09-30 1