Quarterly US dollars
1986-09-30 0
1986-12-31 0
1987-03-31 0
1987-06-30 0
1987-09-30 0
1987-12-31 0
1988-03-31 0
1988-06-30 0
1988-09-30 2
1988-12-31 0
1989-03-31 12
1989-06-30 10
1989-09-30 36
1989-12-31 40
1990-03-31 62
1990-06-30 56
1990-09-30 148
1990-12-31 171
1991-03-31 5
1991-06-30 5
1991-09-30 5
1991-12-31 0
1992-03-31 0
1992-06-30 1
1992-09-30 1
1992-12-31 0
1993-03-31 0
1993-06-30 0
1993-09-30 0
1993-12-31 0
1994-03-31 0
1994-06-30 0
1994-09-30 0
1994-12-31 0
1995-03-31 0
1995-06-30 3
1995-09-30 5
1995-12-31 4
1996-03-31 4
1996-06-30 6
1996-09-30 1
1996-12-31 1
1997-03-31 1
1997-06-30 1
1997-09-30 0
1997-12-31 1
1998-03-31 1
1998-06-30 0
1998-09-30 0
1998-12-31 8
1999-03-31 2
1999-06-30 2
1999-09-30 1
1999-12-31 1
2000-03-31 0
2000-06-30 0
2000-09-30 0
2000-12-31 0
2001-03-31 0
2001-06-30 8
2001-09-30 7
2001-12-31 7
2002-03-31 44
2002-06-30 7
2002-09-30 9
2002-12-31 9
2003-03-31 9
2003-06-30 1
2003-09-30 1
2003-12-31 1
2004-03-31 1
2004-06-30 14
2004-09-30 14
2004-12-31 15
2005-03-31 16
2005-06-30 16
2005-09-30 26
2005-12-31 29
2006-03-31 22
2006-06-30 24
2006-09-30 32
2006-12-31 27
2007-03-31 22
2007-06-30 37
2007-09-30 121
2007-12-31 142
2008-03-31 71
2008-06-30 196
2008-09-30 224
2008-12-31 501
2009-03-31 315
2009-06-30 444
2009-09-30 555
2009-12-31 548
2010-03-31 530
2010-06-30 506
2010-09-30 556
2010-12-31 344
2011-03-31 362
2011-06-30 355
2011-09-30 312
2011-12-31 319
2012-03-31 342
2012-06-30 321
2012-09-30 300
2012-12-31 310
2013-03-31 294
2013-06-30 325
2013-09-30 388
2013-12-31 442
2014-03-31 467
2014-06-30 471
2014-09-30 426
2014-12-31 411
2015-03-31 384
2015-06-30 367
2015-09-30 361
2015-12-31 320
2016-03-31 328
2016-06-30 297
2016-09-30 339
2016-12-31 323
2017-03-31 331
2017-06-30 324
2017-09-30 272
2017-12-31 277
2018-03-31 273
2018-06-30 188
2018-09-30 179
2018-12-31 179
2019-03-31 177
2019-06-30 172
2019-09-30 129
2019-12-31 133
2020-03-31 130
2020-06-30 108
2020-09-30 123
2020-12-31 59
2021-03-31 51
2021-06-30 27
2021-09-30 39
2021-12-31 1
2022-03-31 13
2022-06-30 1
2022-09-30 2
2022-12-31 7
2023-03-31 8
2023-06-30 24
2023-09-30 16