Quarterly Millions of US Dollars
1987-04-01 2490
1987-07-01 2692
1987-10-01 903
1988-01-01 1294
1988-04-01 2039
1988-07-01 3357
1988-10-01 5461
1989-01-01 5246
1989-04-01 14106
1989-07-01 14866
1989-10-01 13552
1990-01-01 19528
1990-04-01 17390
1990-07-01 16726
1990-10-01 10944
1991-01-01 9790
1991-04-01 13693
1991-07-01 11976
1991-10-01 11885
1992-01-01 10533
1992-04-01 13673
1992-07-01 16399
1992-10-01 18281
1993-01-01 18296
1993-04-01 20512
1993-07-01 15082
1993-10-01 13622
1994-01-01 12578
1994-04-01 10985
1994-07-01 14018
1994-10-01 16757
1995-01-01 16097
1995-04-01 17300
1995-07-01 15774
1995-10-01 17596
1996-01-01 15904
1996-04-01 15394
1996-07-01 14546
1996-10-01 13502
1997-01-01 12464
1997-04-01 11854
1997-07-01 14937
1997-10-01 18105
1998-01-01 16424
1998-04-01 16491
1998-07-01 17600
1998-10-01 16403
1999-01-01 13705
1999-04-01 10902
1999-07-01 9579
1999-10-01 12075
2000-01-01 10743
2000-04-01 12122
2000-07-01 12860
2000-10-01 14910
2001-01-01 14340
2001-04-01 13096
2001-07-01 11679
2001-10-01 9330
2002-01-01 8782
2002-04-01 8708
2002-07-01 6948
2002-10-01 7237
2003-01-01 6160
2003-04-01 6580
2003-07-01 7125
2003-10-01 9377
2004-01-01 9103
2004-04-01 10225
2004-07-01 10534
2004-10-01 12649
2005-01-01 11036
2005-04-01 12257
2005-07-01 10785
2005-10-01 11220
2006-01-01 13020
2006-04-01 13549
2006-07-01 11366
2006-10-01 10488
2007-01-01 9679
2007-04-01 9961
2007-07-01 7782
2007-10-01 6907
2008-01-01 6849
2008-04-01 6347
2008-07-01 6220
2008-10-01 5111
2009-01-01 4007
2009-04-01 4099
2009-07-01 3732
2009-10-01 5375
2010-01-01 6447
2010-04-01 7834
2010-07-01 6377
2010-10-01 8068
2011-01-01 7771
2011-04-01 8392
2011-07-01 8426
2011-10-01 8963
2012-01-01 8468
2012-04-01 8907
2012-07-01 8185
2012-10-01 7956
2013-01-01 6973
2013-04-01 7919
2013-07-01 7740
2013-10-01 7790
2014-01-01 6683
2014-04-01 7302
2014-07-01 6433
2014-10-01 6322
2015-01-01 5887
2015-04-01 6446
2015-07-01 7198
2015-10-01 7227
2016-01-01 6891
2016-04-01 9783
2016-07-01 8602
2016-10-01 9233
2017-01-01 10415
2017-04-01 10874
2017-07-01 12590
2017-10-01 14041
2018-01-01 13096