Quarterly Millions of US Dollars
1985-01-01 20
1985-04-01 20
1985-07-01 23
1985-10-01 25
1986-01-01 28
1986-04-01 31
1986-07-01 60
1986-10-01 58
1987-01-01 64
1987-04-01 63
1987-07-01 64
1987-10-01 77
1988-01-01 75
1988-04-01 107
1988-07-01 106
1988-10-01 114
1989-01-01 108
1989-04-01 99
1989-07-01 103
1989-10-01 100
1990-01-01 59
1990-04-01 61
1990-07-01 67
1990-10-01 69
1991-01-01 66
1991-04-01 67
1991-07-01 38
1991-10-01 40
1992-01-01 38
1992-04-01 40
1992-07-01 42
1992-10-01 40
1993-01-01 43
1993-04-01 47
1993-07-01 47
1993-10-01 45
1994-01-01 49
1994-04-01 64
1994-07-01 64
1994-10-01 94
1995-01-01 101
1995-04-01 102
1995-07-01 94
1995-10-01 216
1996-01-01 412
1996-04-01 291
1996-07-01 307
1996-10-01 222
1997-01-01 94
1997-04-01 227
1997-07-01 115
1997-10-01 68
1998-01-01 68
1998-04-01 30
1998-07-01 30
1998-10-01 30
1999-01-01 30
1999-04-01 30
1999-07-01 30
2000-04-01 100
2000-07-01 100
2000-10-01 100
2001-01-01 100
2001-04-01 100
2001-07-01 100
2001-10-01 250
2002-01-01 250
2002-04-01 250
2002-07-01 250
2002-10-01 250
2003-01-01 250
2003-04-01 250
2003-07-01 250
2003-10-01 250
2004-01-01 250
2004-04-01 250
2004-07-01 252
2004-10-01 271
2005-01-01 485
2005-04-01 486
2005-07-01 475
2005-10-01 589
2006-01-01 588
2006-04-01 739
2006-07-01 763
2006-10-01 813
2007-01-01 813
2007-04-01 823
2007-07-01 850
2007-10-01 904
2008-01-01 1253
2008-04-01 1253
2008-07-01 1258
2008-10-01 1244
2009-01-01 1218
2009-04-01 1193
2009-07-01 1198
2009-10-01 1636
2010-01-01 1266
2010-04-01 1351
2010-07-01 1551
2010-10-01 1541
2011-01-01 1541
2011-04-01 1541
2011-07-01 1400
2011-10-01 1395
2012-01-01 1395
2012-04-01 1407
2012-07-01 1657
2012-10-01 1649
2013-01-01 1649
2013-04-01 2121
2013-07-01 2128
2013-10-01 2150
2014-01-01 3400
2014-04-01 2950
2014-07-01 2950
2014-10-01 2760
2015-01-01 2760
2015-04-01 2760
2015-07-01 3121
2015-10-01 3116
2016-01-01 3113
2016-04-01 2963
2016-07-01 2876
2016-10-01 2874
2017-01-01 2874
2017-04-01 3154
2017-07-01 1892
2017-10-01 1876
2018-01-01 1876
2018-04-01 1876