Quarter	Net Percent
1970-01-01	54
1970-04-01	62
1970-07-01	68
1970-10-01	59
1971-01-01	41
1971-04-01	43
1971-07-01	33
1971-10-01	30
1972-01-01	42
1972-04-01	38
1972-07-01	59
1972-10-01	65
1973-01-01	76
1973-04-01	88
1973-07-01	84
1973-10-01	86
1974-01-01	86
1974-04-01	71
1974-07-01	64
1974-10-01	33
1975-01-01	36
1975-04-01	29
1975-07-01	40
1975-10-01	22
1976-01-01	41
1976-04-01	3
1976-07-01	-15
1976-10-01	-9
1977-01-01	-12
1977-04-01	6
1977-07-01	23
1977-10-01	48
1978-01-01	54
1978-04-01	40
1978-07-01	50
1978-10-01	58
1979-01-01	46
1979-04-01	77
1979-07-01	85
1979-10-01	82
1980-01-01	87
1980-04-01	75
1980-07-01	71
1980-10-01	76
1981-01-01	59
1981-04-01	43
1981-07-01	38
1981-10-01	17
1982-01-01	-15
1982-04-01	-34
1982-07-01	-45
1982-10-01	-40
1983-01-01	-10
1983-04-01	-1
1983-07-01	19
1983-10-01	28
1984-01-01	33
1984-04-01	2
1984-07-01	-17
1984-10-01	-37
1985-01-01	-38
1985-04-01	-46
1985-07-01	-37
1985-10-01	-16
1986-01-01	-2
1986-04-01	14
1986-07-01	15
1986-10-01	31
1987-01-01	34
1987-04-01	37
1987-07-01	37
1987-10-01	47
1988-01-01	63
1988-04-01	68
1988-07-01	41
1988-10-01	38
1989-01-01	31
1989-04-01	22
1989-07-01	15
1989-10-01	5
1990-01-01	6
1990-04-01	9
1990-07-01	-23
1990-10-01	-29
1991-01-01	-22
1991-04-01	-22
1991-07-01	-28
1991-10-01	-30
1992-01-01	-16
1992-04-01	-20
1992-07-01	-35
1992-10-01	-40
1993-01-01	-18
1993-04-01	-24
1993-07-01	-16
1993-10-01	12
1994-01-01	9
1994-04-01	25
1994-07-01	51
1994-10-01	57
1995-01-01	58
1995-04-01	42
1995-07-01	26
1995-10-01	26
1996-01-01	-7
1996-04-01	5
1996-07-01	-5
1996-10-01	9
1997-01-01	25
1997-04-01	5
1997-07-01	8
1997-10-01	8
1998-01-01	-27
1998-04-01	-40
1998-07-01	-39
1998-10-01	-42
1999-01-01	-48
1999-04-01	-30
1999-07-01	-2
1999-10-01	13
2000-01-01	15
2000-04-01	12
2000-07-01	23
2000-10-01	6
2001-01-01	4
2001-04-01	7
2001-07-01	6
2001-10-01	21
2002-01-01	37
2002-04-01	43
2002-07-01	50
2002-10-01	44
2003-01-01	12
2003-04-01	-14
2003-07-01	-15
2003-10-01	-16
2004-01-01	4
2004-04-01	12
2004-07-01	26
2004-10-01	41
2005-01-01	4
2005-04-01	18
2005-07-01	34
2005-10-01	33
2006-01-01	24
2006-04-01	30
2006-07-01	29
2006-10-01	54
2007-01-01	46
2007-04-01	41
2007-07-01	21
2007-10-01	33
2008-01-01	-20
2008-04-01	-16
2008-07-01	-30
2008-10-01	-41
2009-01-01	-45
2009-04-01	-69
2009-07-01	-51
2009-10-01	-26
2010-01-01	-14
2010-04-01	-5
2010-07-01	6
2010-10-01	5
2011-01-01	15
2011-04-01	14
2011-07-01	1
2011-10-01	18
2012-01-01	24
2012-04-01	11
2012-07-01	5
2012-10-01	20
2013-01-01	10
2013-04-01	7
2013-07-01	15
2013-10-01	8
2014-01-01	-1
2014-04-01	-45
2014-07-01	-9
2014-10-01	18
2015-01-01	-6
2015-04-01	1
2015-07-01	-16
2015-10-01	-8
2016-01-01	-11
2016-04-01	-18
2016-07-01	-27
2016-10-01	-15
2017-01-01	-16