Quarter	Percent
1960-01-01	4.1700
1960-04-01	4.1500
1960-07-01	4.1500
1960-10-01	3.7000
1961-01-01	3.7000
1961-04-01	3.7600
1961-07-01	3.5700
1961-10-01	3.5800
1962-01-01	3.6500
1962-04-01	3.5900
1962-07-01	3.4800
1962-10-01	3.5100
1963-01-01	3.4400
1963-04-01	4.9300
1963-07-01	3.2500
1963-10-01	4.9100
1964-01-01	5.0600
1964-04-01	4.8600
1964-07-01	4.7500
1964-10-01	4.1800
1965-01-01	4.4200
1965-04-01	4.4000
1965-07-01	3.8100
1965-10-01	4.4800
1966-01-01	4.5500
1966-04-01	4.7800
1966-07-01	4.6000
1966-10-01	5.7000
1967-01-01	5.0000
1967-04-01	4.5000
1967-07-01	4.3100
1967-10-01	4.7600
1968-01-01	5.0800
1968-04-01	5.7700
1968-07-01	6.7200
1968-10-01	8.2500
1969-01-01	8.1800
1969-04-01	9.4700
1969-07-01	9.4000
1969-10-01	10.4200
1970-01-01	9.4560
1970-04-01	9.3420
1970-07-01	8.1210
1970-10-01	7.4760
1971-01-01	5.7660
1971-04-01	6.4500
1971-07-01	5.9750
1971-10-01	5.2940
1972-01-01	4.7780
1972-04-01	3.8460
1972-07-01	3.8790
1972-10-01	7.3100
1973-01-01	7.5080
1973-04-01	7.6630
1973-07-01	10.1270
1973-10-01	11.5160
1974-01-01	12.1490
1974-04-01	13.5670
1974-07-01	13.4250
1974-10-01	11.8670
1975-01-01	9.1730
1975-04-01	7.3210
1975-07-01	6.9170
1975-10-01	6.4520
1976-01-01	7.6330
1976-04-01	7.6270
1976-07-01	9.2480
1976-10-01	10.4360
1977-01-01	9.7340
1977-04-01	8.9210
1977-07-01	8.2980
1977-10-01	9.2980
1978-01-01	9.9600
1978-04-01	7.7630
1978-07-01	7.2000
1978-10-01	6.6690
1979-01-01	6.7700
1979-04-01	8.0130
1979-07-01	10.9960
1979-10-01	12.1730
1980-01-01	12.9580
1980-04-01	12.4270
1980-07-01	11.3730
1980-10-01	10.8750
1981-01-01	11.7180
1981-04-01	19.9330
1981-07-01	17.7750
1981-10-01	15.4640
1982-01-01	15.7160
1982-04-01	15.9750
1982-07-01	14.1130
1982-10-01	12.8790
1983-01-01	12.8390
1983-04-01	12.6080
1983-07-01	12.5670
1983-10-01	12.2700
1984-01-01	12.4820
1984-04-01	12.1150
1984-07-01	11.3620
1984-10-01	10.9520
1985-01-01	10.6710
1985-04-01	10.2260
1985-07-01	9.5750
1985-10-01	9.0161
1986-01-01	8.5222
1986-04-01	7.2458
1986-07-01	7.0854
1986-10-01	7.8044
1987-01-01	7.8871
1987-04-01	8.0104
1987-07-01	7.3604
1987-10-01	8.0343
1988-01-01	7.5383
1988-04-01	7.1104
1988-07-01	7.5229
1988-10-01	8.2016
1989-01-01	8.4476
1989-04-01	8.9292
1989-07-01	8.9375
1989-10-01	10.4819
1990-01-01	10.1935
1990-04-01	9.8438
1990-07-01	9.7917
1990-10-01	9.7157
1991-01-01	9.3669
1991-04-01	9.8938
1991-07-01	9.2063
1991-10-01	10.0726
1992-01-01	9.9315
1992-04-01	9.9417
1992-07-01	13.5292
1992-10-01	10.0484
1993-01-01	11.0141
1993-04-01	7.6813
1993-07-01	7.3229
1993-10-01	6.6310
1994-01-01	6.2964
1994-04-01	5.4354
1994-07-01	5.3125
1994-10-01	5.3226
1995-01-01	7.4435
1995-04-01	7.3708
1995-07-01	5.6188
1995-10-01	5.0081
1996-01-01	4.0444
1996-04-01	3.7438
1996-07-01	3.4771
1996-10-01	3.2863
1997-01-01	3.1875
1997-04-01	3.1896
1997-07-01	3.1875
1997-10-01	3.3750
1998-01-01	3.3750
1998-04-01	3.3771
1998-07-01	3.3750
1998-10-01	3.0927
1999-01-01	2.9252
1999-04-01	2.5632
1999-07-01	2.4336
1999-10-01	3.0418
2000-01-01	3.5104
2000-04-01	4.2945
2000-07-01	4.5905
2000-10-01	4.8268
2001-01-01	4.7814
2001-04-01	4.5395
2001-07-01	3.9865
2001-10-01	3.3389
2002-01-01	3.2640
2002-04-01	3.3485
2002-07-01	3.3186
2002-10-01	3.0945
2003-01-01	2.7490
2003-04-01	2.2133
2003-07-01	2.0209
2003-10-01	2.0567
2004-01-01	2.0057
2004-04-01	2.0277
2004-07-01	2.0518
2004-10-01	2.0535
2005-01-01	2.0567
2005-04-01	2.0623
2005-07-01	2.0941
2005-10-01	2.2757
2006-01-01	2.5200
2006-04-01	2.6977
2006-07-01	3.0410
2006-10-01	3.5011
2007-01-01	3.6909
2007-04-01	3.9557
2007-07-01	4.0286
2007-10-01	3.8791
2008-01-01	4.0910
2008-04-01	4.0067
2008-07-01	4.2733
2008-10-01	2.4864
2009-01-01	1.0620
2009-04-01	0.6980
2009-07-01	0.3632
2009-10-01	0.3546
2010-01-01	0.3477
2010-04-01	0.3543
2010-07-01	0.4536
2010-10-01	0.4981
2011-01-01	0.6587
2011-04-01	1.1240
2011-07-01	1.0055
2011-10-01	0.6270
2012-01-01	0.3567
2012-04-01	0.3320
2012-07-01	0.0993
2012-10-01	0.0734
2013-01-01	0.0670
2013-04-01	0.0862
2013-07-01	0.0803
2013-10-01	0.1686
2014-01-01	0.1919
2014-04-01	0.0758
2014-07-01	0.0066
2014-10-01	-0.0301
2015-01-01	-0.0504
2015-04-01	-0.1185
2015-07-01	-0.1357
2015-10-01	-0.1990
2016-01-01	-0.2877
2016-04-01	-0.3325
2016-07-01	-0.3430
2016-10-01	-0.3504
2017-01-01	-0.3535
2017-04-01	-0.3587
2017-07-01	-0.3581
2017-10-01	-0.3423
2018-01-01	-0.3639
2018-04-01	-0.3618
2018-07-01	-0.3627