Quarterly Millions of US Dollars
1987-01-01 0
1987-04-01 0
1987-07-01 0
1987-10-01 0
1988-01-01 0
1988-04-01 0
1988-07-01 0
1988-10-01 0
1989-01-01 0
1989-04-01 0
1989-07-01 0
1989-10-01 0
1990-01-01 0
1990-04-01 0
1990-07-01 0
1990-10-01 0
1991-01-01 0
1991-04-01 0
1991-07-01 0
1991-10-01 0
1992-01-01 0
1992-04-01 0
1992-07-01 0
1992-10-01 0
1993-01-01 0
1993-04-01 0
1993-07-01 338
1993-10-01 436
1994-01-01 554
1994-04-01 440
1994-07-01 859
1994-10-01 841
1995-01-01 345
1995-04-01 327
1995-07-01 379
1995-10-01 511
1996-01-01 430
1996-04-01 630
1996-07-01 306
1996-10-01 831
1997-01-01 933
1997-04-01 936
1997-07-01 959
1997-10-01 1240
1998-01-01 1257
1998-04-01 2193
1998-07-01 2716
1998-10-01 2622
1999-01-01 3087
1999-04-01 2310
1999-07-01 3200
1999-10-01 3084
2000-01-01 2661
2000-04-01 2572
2000-07-01 2261
2000-10-01 1611
2001-01-01 1782
2001-04-01 2247
2001-07-01 1789
2001-10-01 2124
2002-01-01 3448
2002-04-01 3431
2002-07-01 3671
2002-10-01 4324
2003-01-01 3910
2003-04-01 4122
2003-07-01 3777
2003-10-01 3689
2004-01-01 4084
2004-04-01 4166
2004-07-01 4558
2004-10-01 6304
2005-01-01 5462
2005-04-01 5718
2005-07-01 6064
2005-10-01 4984
2006-01-01 6034
2006-04-01 6794
2006-07-01 6551
2006-10-01 8296
2007-01-01 13231
2007-04-01 15020
2007-07-01 14206
2007-10-01 14366
2008-01-01 9754
2008-04-01 12612
2008-07-01 17027
2008-10-01 14208
2009-01-01 8671
2009-04-01 10106
2009-07-01 13243
2009-10-01 16494
2010-01-01 16601
2010-04-01 15208
2010-07-01 15090
2010-10-01 13694
2011-01-01 11269
2011-04-01 9834
2011-07-01 9381
2011-10-01 9478
2012-01-01 8604
2012-04-01 9585
2012-07-01 9977
2012-10-01 10856
2013-01-01 11595
2013-04-01 10871
2013-07-01 10205
2013-10-01 7729
2014-01-01 5972
2014-04-01 6329
2014-07-01 5724
2014-10-01 6938
2015-01-01 4745
2015-04-01 2502
2015-07-01 2474
2015-10-01 1930
2016-01-01 5460
2016-04-01 5783
2016-07-01 4038
2016-10-01 3416
2017-01-01 5071
2017-04-01 4982
2017-07-01 4531
2017-10-01 4393
2018-01-01 1348
2018-04-01 850