Quarter	Percentage of GDP
1997-07-01	68.8
1997-10-01	69.2
1998-01-01	69.1
1998-04-01	69.7
1998-07-01	69.9
1998-10-01	70.7
1999-01-01	70.3
1999-04-01	70.7
1999-07-01	70.9
1999-10-01	71.7
2000-01-01	72.5
2000-04-01	72.6
2000-07-01	72.9
2000-10-01	73.1
2001-01-01	73.8
2001-04-01	73.6
2001-07-01	73.5
2001-10-01	73.9
2002-01-01	73.5
2002-04-01	73.3
2002-07-01	73.4
2002-10-01	73.8
2003-01-01	73.9
2003-04-01	74.2
2003-07-01	74.1
2003-10-01	74.3
2004-01-01	74.6
2004-04-01	74.8
2004-07-01	74.7
2004-10-01	75.2
2005-01-01	76.0
2005-04-01	76.8
2005-07-01	77.5
2005-10-01	77.9
2006-01-01	79.1
2006-04-01	79.6
2006-07-01	80.2
2006-10-01	80.8
2007-01-01	81.4
2007-04-01	82.1
2007-07-01	82.9
2007-10-01	83.9
2008-01-01	84.6
2008-04-01	84.9
2008-07-01	85.1
2008-10-01	85.6
2009-01-01	85.9
2009-04-01	86.6
2009-07-01	86.5
2009-10-01	86.3
2010-01-01	87.6
2010-04-01	86.7
2010-07-01	85.7
2010-10-01	84.8
2011-01-01	84.4
2011-04-01	84.0
2011-07-01	83.7
2011-10-01	83.7
2012-01-01	83.5
2012-04-01	83.2
2012-07-01	82.8
2012-10-01	82.6
2013-01-01	82.4
2013-04-01	81.9
2013-07-01	81.7
2013-10-01	81.4
2014-01-01	81.0
2014-04-01	80.7
2014-07-01	80.4
2014-10-01	80.4
2015-01-01	80.2
2015-04-01	80.0
2015-07-01	79.9
2015-10-01	80.2
2016-01-01	80.5
2016-04-01	80.7
2016-07-01	80.8
2016-10-01	81.0
2017-01-01	81.1
2017-04-01	80.9
2017-07-01	80.6
2017-10-01	80.7
2018-01-01	80.4