Quarter	Millions of US Dollars
1996-04-01	39
1996-07-01	39
1996-10-01	39
1997-01-01	36
1997-04-01	28
1997-07-01	27
1997-10-01	27
1998-01-01	26
1998-04-01	30
1998-07-01	32
1998-10-01	25
1999-01-01	21
1999-04-01	32
1999-07-01	33
1999-10-01	30
2000-01-01	28
2000-04-01	25
2000-07-01	21
2000-10-01	21
2001-01-01	20
2001-04-01	16
2001-07-01	15
2001-10-01	13
2002-01-01	13
2002-04-01	111
2002-07-01	110
2002-10-01	113
2003-01-01	117
2003-04-01	119
2003-07-01	121
2003-10-01	129
2004-01-01	125
2004-04-01	156
2004-07-01	160
2004-10-01	175
2005-01-01	167
2005-04-01	156
2005-07-01	155
2005-10-01	159
2006-01-01	164
2006-04-01	172
2006-07-01	171
2006-10-01	178
2007-01-01	180
2007-04-01	47
2007-07-01	50
2007-10-01	89
2008-01-01	96
2008-04-01	96
2008-07-01	87
2008-10-01	84
2009-01-01	81
2009-04-01	86
2009-07-01	89
2009-10-01	87
2010-01-01	82
2010-04-01	74
2010-07-01	83
2010-10-01	81
2011-01-01	86
2011-04-01	88
2011-07-01	82
2011-10-01	79
2012-01-01	81
2012-04-01	76
2012-07-01	78
2012-10-01	80
2013-01-01	78
2013-04-01	79
2013-07-01	82
2013-10-01	84
2014-01-01	84
2014-04-01	44
2014-07-01	40
2014-10-01	39
2015-01-01	34
2015-04-01	36
2015-07-01	36
2015-10-01	28
2016-01-01	29
2016-04-01	28
2016-07-01	29
2016-10-01	27
2017-01-01	27
2017-04-01	29
2017-07-01	30
2017-10-01	31
2018-01-01	31
2018-04-01	30