Quarter	Millions of US Dollars
1990-04-01	150
1990-07-01	150
1990-10-01	150
1991-01-01	150
1991-04-01	150
1991-07-01	150
1991-10-01	150
1992-01-01	150
1992-04-01	150
1992-07-01	150
1992-10-01	150
1993-01-01	150
1993-04-01	150
1993-07-01	1052
1993-10-01	1010
1994-01-01	597
1994-04-01	739
1994-07-01	594
1994-10-01	557
1995-01-01	503
1995-04-01	534
1995-07-01	561
1995-10-01	523
1996-01-01	507
1996-04-01	482
1996-07-01	490
1996-10-01	585
1997-01-01	586
1997-04-01	914
1997-07-01	880
1997-10-01	882
1998-01-01	968
1998-04-01	945
1998-07-01	1318
1998-10-01	1243
1999-01-01	1199
1999-04-01	1436
1999-07-01	1499
1999-10-01	1462
2000-01-01	1403
2000-04-01	1381
2000-07-01	1338
2000-10-01	1314
2001-01-01	1344
2001-04-01	1556
2001-07-01	1673
2001-10-01	1772
2002-01-01	2253
2002-04-01	2037
2002-07-01	2086
2002-10-01	2034
2003-01-01	2074
2003-04-01	2171
2003-07-01	2572
2003-10-01	3803
2004-01-01	4726
2004-04-01	4870
2004-07-01	6235
2004-10-01	7035
2005-01-01	7224
2005-04-01	7673
2005-07-01	7908
2005-10-01	7251
2006-01-01	7997
2006-04-01	9127
2006-07-01	9247
2006-10-01	9224
2007-01-01	11123
2007-04-01	14314
2007-07-01	12441
2007-10-01	12610
2008-01-01	14240
2008-04-01	14288
2008-07-01	14732
2008-10-01	10236
2009-01-01	9173
2009-04-01	12537
2009-07-01	13268
2009-10-01	13053
2010-01-01	13753
2010-04-01	11915
2010-07-01	12655
2010-10-01	13576
2011-01-01	14909
2011-04-01	16580
2011-07-01	17219
2011-10-01	18095
2012-01-01	12633
2012-04-01	11644
2012-07-01	5666
2012-10-01	11089
2013-01-01	11218
2013-04-01	11701
2013-07-01	12090
2013-10-01	8544
2014-01-01	11267
2014-04-01	12158
2014-07-01	9155
2014-10-01	9001
2015-01-01	7633
2015-04-01	9366
2015-07-01	9455
2015-10-01	9194
2016-01-01	9272
2016-04-01	9703
2016-07-01	11765
2016-10-01	11757
2017-01-01	15216
2017-04-01	19179
2017-07-01	21932
2017-10-01	22165
2018-01-01	24116
2018-04-01	22071