Quarter	Percent
1980-04-01	18.800000000
1980-07-01	14.900000000
1980-10-01	15.300000000
1981-01-01	18.800000000
1981-04-01	15.300000000
1981-07-01	16.800000000
1981-10-01	15.100000000
1982-01-01	21.700000000
1982-04-01	16.500000000
1982-07-01	23.300000000
1982-10-01	15.000000000
1983-01-01	19.600000000
1983-04-01	18.500000000
1983-07-01	13.300000000
1983-10-01	12.500000000
1984-01-01	16.300000000
1984-04-01	16.300000000
1984-07-01	16.200000000
1984-10-01	16.000000000
1985-01-01	18.100000000
1985-04-01	16.700000000
1985-07-01	17.400000000
1985-10-01	18.400000000
1986-01-01	21.700000000
1986-04-01	22.100000000
1986-07-01	16.000000000
1986-10-01	21.200000000
1987-01-01	22.800000000
1987-04-01	15.700000000
1987-07-01	11.000000000
1987-10-01	16.000000000
1988-01-01	16.500000000
1988-04-01	17.000000000
1988-07-01	11.300000000
1988-10-01	20.900000000
1989-01-01	19.700000000
1989-04-01	21.000000000
1989-07-01	14.900000000
1989-10-01	19.300000000
1990-01-01	17.100000000
1990-04-01	22.200000000
1990-07-01	19.100000000
1990-10-01	23.300000000
1991-01-01	21.200000000
1991-04-01	17.800000000
1991-07-01	20.200000000
1991-10-01	28.600000000
1992-01-01	24.100000000
1992-04-01	22.300000000
1992-07-01	30.700000000
1992-10-01	28.700000000
1993-01-01	26.500000000
1993-04-01	21.300000000
1993-07-01	25.000000000
1993-10-01	19.900000000
1994-01-01	19.800000000
1994-04-01	27.600000000
1994-07-01	18.400000000
1994-10-01	17.500000000
1995-01-01	17.000000000
1995-04-01	15.900000000
1995-07-01	15.600000000
1995-10-01	14.400000000
1996-01-01	13.770200000
1996-04-01	13.642277780
1996-07-01	12.586142860
1996-10-01	12.837894740
1997-01-01	11.742315790
1997-04-01	11.733900000
1997-07-01	10.945000000
1997-10-01	11.035095240
1998-01-01	13.174950000
1998-04-01	13.436952380
1998-07-01	11.733181820
1998-10-01	11.940090910
1999-01-01	10.147409090
1999-04-01	10.382227270
1999-07-01	10.334909090
1999-10-01	9.830454545
2000-01-01	9.091545455
2000-04-01	8.414666667
2000-07-01	7.910142857
2000-10-01	6.158210526
2001-01-01	4.781400000
2001-04-01	4.539500000
2001-07-01	3.986500000
2001-10-01	3.338900000
2002-01-01	3.264000000
2002-04-01	3.348500000
2002-07-01	3.318600000
2002-10-01	3.094500000
2003-01-01	2.749000000
2003-04-01	2.213300000
2003-07-01	2.020900000
2003-10-01	2.056700000
2004-01-01	2.005700000
2004-04-01	2.027700000
2004-07-01	2.051800000
2004-10-01	2.053500000
2005-01-01	2.056700000
2005-04-01	2.062300000
2005-07-01	2.094100000
2005-10-01	2.275700000
2006-01-01	2.520000000
2006-04-01	2.697700000
2006-07-01	3.041000000
2006-10-01	3.501100000
2007-01-01	3.690900000
2007-04-01	3.955700000
2007-07-01	4.028600000
2007-10-01	3.879100000
2008-01-01	4.091000000
2008-04-01	4.006700000
2008-07-01	4.273300000
2008-10-01	2.486400000
2009-01-01	1.062000000
2009-04-01	0.698000000
2009-07-01	0.363200000
2009-10-01	0.354600000
2010-01-01	0.347700000
2010-04-01	0.354300000
2010-07-01	0.453600000
2010-10-01	0.498100000
2011-01-01	0.658700000
2011-04-01	1.124000000
2011-07-01	1.005500000
2011-10-01	0.627000000
2012-01-01	0.356700000
2012-04-01	0.332000000
2012-07-01	0.099300000
2012-10-01	0.073400000
2013-01-01	0.067000000
2013-04-01	0.086200000
2013-07-01	0.080300000
2013-10-01	0.168600000
2014-01-01	0.191900000
2014-04-01	0.075800000
2014-07-01	0.006600000
2014-10-01	-0.030100000
2015-01-01	-0.050400000
2015-04-01	-0.118500000
2015-07-01	-0.135700000
2015-10-01	-0.199000000
2016-01-01	-0.287700000
2016-04-01	-0.332500000
2016-07-01	-0.343000000
2016-10-01	-0.350400000
2017-01-01	-0.353500000
2017-04-01	-0.358700000
2017-07-01	-0.358100000
2017-10-01	-0.342300000
2018-01-01	-0.363900000
2018-04-01	-0.361800000
2018-07-01	-0.362700000