Quarter	Millions of US Dollars
1990-01-01	3242
1990-04-01	3772
1990-07-01	4486
1990-10-01	4412
1991-01-01	3856
1991-04-01	4155
1991-07-01	4523
1991-10-01	4371
1992-01-01	3934
1992-04-01	3816
1992-07-01	3055
1992-10-01	2417
1993-01-01	2647
1993-04-01	3754
1993-07-01	3599
1993-10-01	3459
1994-01-01	3504
1994-04-01	4015
1994-07-01	5524
1994-10-01	5156
1995-01-01	4376
1995-04-01	5867
1995-07-01	5705
1995-10-01	4683
1996-01-01	3946
1996-04-01	6527
1996-07-01	7300
1996-10-01	6207
1997-01-01	6014
1997-04-01	5808
1997-07-01	4952
1997-10-01	4325
1998-01-01	4641
1998-04-01	5263
1998-07-01	4075
1998-10-01	3816
1999-01-01	3515
1999-04-01	3183
1999-07-01	4937
1999-10-01	4809
2000-01-01	2917
2000-04-01	2588
2000-07-01	3713
2000-10-01	3991
2001-01-01	2247
2001-04-01	2313
2001-07-01	3550
2001-10-01	3290
2002-01-01	2494
2002-04-01	2700
2002-07-01	2531
2002-10-01	4850
2003-01-01	4993
2003-04-01	3328
2003-07-01	4767
2003-10-01	7146
2004-01-01	6695
2004-04-01	3679
2004-07-01	6374
2004-10-01	6848
2005-01-01	4013
2005-04-01	3891
2005-07-01	6337
2005-10-01	6258
2006-01-01	3263
2006-04-01	5375
2006-07-01	4620
2006-10-01	2138
2007-01-01	1686
2007-04-01	1777
2007-07-01	1854
2007-10-01	1846
2008-01-01	4351
2008-04-01	4149
2008-07-01	1326
2008-10-01	2076
2009-01-01	6498
2009-04-01	8429
2009-07-01	6777
2009-10-01	6122
2010-01-01	5969
2010-04-01	5572
2010-07-01	5415
2010-10-01	6340
2011-01-01	5886
2011-04-01	13315
2011-07-01	12884
2011-10-01	7248
2012-01-01	7457
2012-04-01	8060
2012-07-01	6610
2012-10-01	14482
2013-01-01	13676
2013-04-01	3688
2013-07-01	3949
2013-10-01	3900
2014-01-01	3388
2014-04-01	3321
2014-07-01	3012
2014-10-01	9177
2015-01-01	9833
2015-04-01	4801
2015-07-01	4313
2015-10-01	4008
2016-01-01	2706
2016-04-01	2801
2016-07-01	2934
2016-10-01	8953
2017-01-01	7769
2017-04-01	7366
2017-07-01	7190
2017-10-01	2919
2018-01-01	11312