Quarterly US dollars
1991-12-31 0
1992-03-31 1
1992-06-30 7
1992-09-30 7
1992-12-31 12
1993-03-31 38
1993-06-30 12
1993-09-30 61
1993-12-31 93
1994-03-31 122
1994-06-30 183
1994-09-30 149
1994-12-31 159
1995-03-31 67
1995-06-30 97
1995-09-30 137
1995-12-31 131
1996-03-31 124
1996-06-30 98
1996-09-30 153
1996-12-31 227
1997-03-31 189
1997-06-30 265
1997-09-30 313
1997-12-31 205
1998-03-31 156
1998-06-30 183
1998-09-30 258
1998-12-31 114
1999-03-31 117
1999-06-30 222
1999-09-30 176
1999-12-31 312
2000-03-31 297
2000-06-30 348
2000-09-30 342
2000-12-31 247
2001-03-31 207
2001-06-30 157
2001-09-30 267
2001-12-31 106
2002-03-31 47
2002-06-30 238
2002-09-30 182
2002-12-31 198
2003-03-31 282
2003-06-30 79
2003-09-30 204
2003-12-31 164
2004-03-31 447
2004-06-30 194
2004-09-30 227
2004-12-31 438
2005-03-31 186
2005-06-30 249
2005-09-30 315
2005-12-31 261
2006-03-31 371
2006-06-30 262
2006-09-30 420
2006-12-31 525
2007-03-31 373
2007-06-30 584
2007-09-30 774
2007-12-31 764
2008-03-31 472
2008-06-30 122
2008-09-30 206
2008-12-31 134
2009-03-31 65
2009-06-30 112
2009-09-30 69
2009-12-31 85
2010-03-31 137
2010-06-30 37
2010-09-30 57
2010-12-31 44
2011-03-31 87
2011-06-30 181
2011-09-30 989
2011-12-31 60
2012-03-31 609
2012-06-30 569
2012-09-30 84
2012-12-31 76
2013-03-31 46
2013-06-30 339
2013-09-30 462
2013-12-31 122
2014-03-31 56
2014-06-30 72
2014-09-30 201
2014-12-31 276
2015-03-31 51
2015-06-30 125
2015-09-30 110
2015-12-31 102
2016-03-31 124
2016-06-30 117
2016-09-30 129
2016-12-31 127
2017-03-31 130
2017-06-30 169
2017-09-30 178
2017-12-31 154
2018-03-31 134
2018-06-30 189
2018-09-30 102
2018-12-31 158
2019-03-31 91
2019-06-30 169
2019-09-30 100
2019-12-31 134
2020-03-31 75
2020-06-30 143
2020-09-30 86
2020-12-31 172
2021-03-31 101
2021-06-30 174
2021-09-30 107
2021-12-31 121
2022-03-31 77
2022-06-30 80
2022-09-30 82
2022-12-31 51
2023-03-31 54
2023-06-30 61
2023-09-30 58