Quarterly Millions of US Dollars
1979-01-01 48
1979-04-01 46
1979-07-01 45
1979-10-01 42
1980-01-01 40
1980-04-01 46
1980-07-01 103
1980-10-01 100
1981-01-01 95
1981-04-01 86
1981-07-01 86
1981-10-01 90
1982-01-01 82
1982-04-01 80
1982-07-01 77
1982-10-01 85
1983-01-01 83
1983-04-01 81
1983-07-01 80
1983-10-01 80
1984-01-01 83
1984-04-01 78
1984-07-01 74
1984-10-01 72
1985-01-01 72
1985-04-01 73
1985-07-01 83
1985-10-01 90
1986-01-01 99
1986-04-01 107
1986-07-01 65
1986-10-01 63
1987-01-01 68
1987-04-01 68
1987-07-01 68
1987-10-01 82
1988-01-01 81
1988-04-01 75
1988-07-01 74
1988-10-01 80
1989-01-01 75
1989-04-01 70
1989-07-01 72
1989-10-01 70
1990-01-01 63
1990-04-01 66
1990-07-01 72
1990-10-01 74
1991-01-01 320
1991-04-01 320
1991-07-01 320
1991-10-01 320
1992-01-01 320
1992-04-01 320
1992-07-01 320
1992-10-01 320
1993-01-01 320
1993-04-01 320
1993-07-01 320
1993-10-01 320
1994-01-01 320
1994-04-01 320
1994-07-01 320
1994-10-01 320
1995-01-01 320
1995-04-01 320
1995-07-01 320
1995-10-01 320
1999-04-01 500
1999-07-01 500
1999-10-01 500
2000-01-01 500
2000-04-01 500
2000-07-01 500
2000-10-01 500
2001-01-01 500
2001-04-01 500
2001-07-01 500
2001-10-01 1150
2002-01-01 1150
2002-04-01 2049
2002-07-01 2046
2002-10-01 2165
2003-01-01 3177
2003-04-01 3193
2003-07-01 3200
2003-10-01 3229
2004-01-01 3817
2004-04-01 3815
2004-07-01 3822
2004-10-01 3859
2005-01-01 3839
2005-04-01 3813
2005-07-01 3450
2005-10-01 3450
2006-01-01 3450
2006-04-01 3450
2006-07-01 3450
2006-10-01 3450
2007-01-01 3450
2007-04-01 3450
2007-07-01 2850
2007-10-01 2850
2008-01-01 2250
2008-04-01 2250
2008-07-01 2250
2008-10-01 2250
2009-01-01 2250
2009-04-01 1750
2009-07-01 1750
2009-10-01 1750
2010-01-01 1750
2010-04-01 1750
2010-07-01 3311
2010-10-01 3331
2011-01-01 3315
2011-04-01 3328
2011-07-01 4593
2011-10-01 4583
2012-01-01 3887
2012-04-01 3852
2012-07-01 3923
2012-10-01 5408
2013-01-01 4419
2013-04-01 4362
2013-07-01 4364
2013-10-01 4329
2014-01-01 4289
2014-04-01 4289
2014-07-01 4272
2014-10-01 6297
2015-01-01 6164
2015-04-01 7745
2015-07-01 7680
2015-10-01 7608
2016-01-01 10462
2016-04-01 10329
2016-07-01 10352
2016-10-01 10134
2017-01-01 10189
2017-04-01 12774
2017-07-01 12962
2017-10-01 13062
2018-01-01 16231
2018-04-01 15857