Quarter	Billions of US Dollars
1994-01-01	21.4
1994-04-01	23.3
1994-07-01	25.3
1994-10-01	27.5
1995-01-01	28.1
1995-04-01	30.3
1995-07-01	29.8
1995-10-01	31.4
1996-01-01	31.4
1996-04-01	32.6
1996-07-01	35.5
1996-10-01	38.7
1997-01-01	38.0
1997-04-01	38.8
1997-07-01	36.6
1997-10-01	37.6
1998-01-01	37.3
1998-04-01	38.7
1998-07-01	35.5
1998-10-01	34.9
1999-01-01	34.9
1999-04-01	30.9
1999-07-01	26.3
1999-10-01	27.9
2000-01-01	25.3
2000-04-01	22.9
2000-07-01	22.0
2000-10-01	21.4
2001-01-01	20.6
2001-04-01	21.0
2001-07-01	20.9
2001-10-01	21.3
2002-01-01	21.4
2002-04-01	20.6
2002-07-01	18.1
2002-10-01	18.5
2003-01-01	18.1
2003-04-01	19.3
2003-07-01	19.2
2003-10-01	20.4
2004-01-01	21.9
2004-04-01	22.8
2004-07-01	24.6
2004-10-01	27.8
2005-01-01	28.6
2005-04-01	30.4
2005-07-01	31.7
2005-10-01	33.4
2006-01-01	34.7
2006-04-01	33.2
2006-07-01	38.9
2006-10-01	44.9
2007-01-01	49.4
2007-04-01	58.0
2007-07-01	60.1
2007-10-01	63.3
2008-01-01	71.9
2008-04-01	71.5
2008-07-01	66.4
2008-10-01	67.2
2009-01-01	58.8
2009-04-01	71.3
2009-07-01	79.4
2009-10-01	75.5
2010-01-01	81.0
2010-04-01	84.7
2010-07-01	95.1
2010-10-01	95.3
2011-01-01	101.0
2011-04-01	112.3
2011-07-01	109.9
2011-10-01	113.7
2012-01-01	126.6
2012-04-01	130.1
2012-07-01	134.9
2012-10-01	143.9
2013-01-01	141.2
2013-04-01	140.6
2013-07-01	145.6
2013-10-01	148.8
2014-01-01	149.9
2014-04-01	163.4
2014-07-01	154.9
2014-10-01	137.1
2015-01-01	130.3
2015-04-01	135.0
2015-07-01	116.4
2015-10-01	119.0
2016-01-01	126.3
2016-04-01	134.1
2016-07-01	138.3
2016-10-01	134.5
2017-01-01	141.7
2017-04-01	137.5
2017-07-01	143.5
2017-10-01	143.6
2018-01-01	155.5