Quarter	Millions of US Dollars
1996-04-01	39
1996-07-01	39
1996-10-01	39
1997-01-01	54
1997-04-01	60
1997-07-01	128
1997-10-01	247
1998-01-01	232
1998-04-01	255
1998-07-01	265
1998-10-01	258
1999-01-01	284
1999-04-01	238
1999-07-01	256
1999-10-01	221
2000-01-01	196
2000-04-01	175
2000-07-01	150
2000-10-01	157
2001-01-01	142
2001-04-01	116
2001-07-01	124
2001-10-01	104
2002-01-01	59
2002-04-01	121
2002-07-01	317
2002-10-01	333
2003-01-01	346
2003-04-01	359
2003-07-01	366
2003-10-01	394
2004-01-01	381
2004-04-01	412
2004-07-01	408
2004-10-01	448
2005-01-01	426
2005-04-01	398
2005-07-01	396
2005-10-01	578
2006-01-01	527
2006-04-01	553
2006-07-01	551
2006-10-01	573
2007-01-01	580
2007-04-01	453
2007-07-01	475
2007-10-01	531
2008-01-01	570
2008-04-01	569
2008-07-01	516
2008-10-01	502
2009-01-01	480
2009-04-01	510
2009-07-01	528
2009-10-01	520
2010-01-01	486
2010-04-01	443
2010-07-01	492
2010-10-01	482
2011-01-01	512
2011-04-01	521
2011-07-01	791
2011-10-01	758
2012-01-01	782
2012-04-01	1115
2012-07-01	1145
2012-10-01	1169
2013-01-01	1134
2013-04-01	1308
2013-07-01	1346
2013-10-01	1370
2014-01-01	1509
2014-04-01	1453
2014-07-01	1344
2014-10-01	1283
2015-01-01	1141
2015-04-01	1185
2015-07-01	1738
2015-10-01	1681
2016-01-01	1760
2016-04-01	1718
2016-07-01	1731
2016-10-01	1633
2017-01-01	1656
2017-04-01	1763
2017-07-01	1825
2017-10-01	1849
2018-01-01	1902
2018-04-01	2064