Quarterly Percent
1975-03-31 10.8934
1975-06-30 9.7234
1975-09-30 9.8019
1975-12-31 10.9453
1976-03-31 9.9063
1976-06-30 9.9556
1976-09-30 10.8
1976-12-31 13.7617
1977-03-31 12.2024
1977-06-30 8.7869
1977-09-30 7.9923
1977-12-31 6.5526
1978-03-31 6.5454
1978-06-30 8.4127
1978-09-30 10
1978-12-31 11.4107
1979-03-31 12.8711
1979-06-30 12.4262
1979-09-30 14
1979-12-31 15.3887
1980-03-31 17
1980-06-30 17
1980-09-30 16.0538
1980-12-31 15.2188
1981-03-31 13.5317
1981-06-30 12
1981-09-30 12.3438
1981-12-31 15.1426
1982-03-31 13.8095
1982-06-30 12.8607
1982-09-30 11.3231
1982-12-31 9.6826
1983-03-31 10.8095
1983-06-30 9.9672
1983-09-30 9.5
1983-12-31 9.0079
1984-03-31 8.9121
1984-06-30 8.9016
1984-09-30 10.9189
1984-12-31 10.0371
1985-03-31 13.0685
1985-06-30 12.6803
1985-09-30 11.7365
1985-12-31 11.5
1986-03-31 12.3033
1986-06-30 10.4504
1986-09-30 10
1986-12-31 10.8516
1987-03-31 10.7976
1987-06-30 9.3504
1987-09-30 9.5885
1987-12-31 9.1836
1988-03-31 8.752
1988-06-30 8.1721
1988-09-30 11.0981
1988-12-31 12.381
1989-03-31 13
1989-06-30 13.4286
1989-09-30 14
1989-12-31 14.9524
1990-03-31 15
1990-06-30 15
1990-09-30 15
1990-12-31 14.0781
1991-03-31 13.5242
1991-06-30 11.8629
1991-09-30 10.9231
1991-12-31 10.5
1992-03-31 10.5
1992-06-30 10.1721
1992-09-30 9.9308
1992-12-31 7.6602
1993-03-31 6.254
1993-06-30 6
1993-09-30 6
1993-12-31 5.7891
1994-03-31 5.3492
1994-06-30 5.25
1994-09-30 5.3654
1994-12-31 5.877
1995-03-31 6.5762
1995-06-30 6.75
1995-09-30 6.75
1995-12-31 6.7063
1996-03-31 6.2344
1996-06-30 5.9303
1996-09-30 5.75
1996-12-31 5.917
1997-03-31 6
1997-06-30 6.2212
1997-09-30 6.8692
1997-12-31 7.1484
1998-03-31 7.25
1998-06-30 7.3279
1998-09-30 7.5
1998-12-31 6.8633
1999-03-31 5.6944
1999-06-30 5.2008
1999-09-30 5.0635
1999-12-31 5.4048
2000-03-31 5.8633
2000-06-30 6
2000-09-30 6
2000-12-31 6
2001-03-31 5.8555
2001-06-30 5.3648
2001-09-30 5.0547
2001-12-31 4.2305
2002-03-31 4
2002-06-30 4
2002-09-30 4
2002-12-31 4
2003-03-31 3.8532
2003-06-30 3.75
2003-09-30 3.5308
2003-12-31 3.6484
2004-03-31 3.9063
2004-06-30 4.2172
2004-09-30 4.6538
2004-12-31 4.75
2005-03-31 4.75
2005-06-30 4.75
2005-09-30 4.5923
2005-12-31 4.5
2006-03-31 4.5
2006-06-30 4.5
2006-09-30 4.6602
2006-12-31 4.8889
2007-03-31 5.2227
2007-06-30 5.3975
2007-09-30 5.7383
2007-12-31 5.6875
2008-03-31 5.3548
2008-06-30 5.0278
2008-09-30 5
2008-12-31 3.3672
2009-03-31 1.0714
2009-06-30 0.5
2009-09-30 0.5
2009-12-31 0.5
2010-03-31 0.5
2010-06-30 0.5
2010-09-30 0.5
2010-12-31 0.5
2011-03-31 0.5
2011-06-30 0.5
2011-09-30 0.5
2011-12-31 0.5
2012-03-31 0.5
2012-06-30 0.5
2012-09-30 0.5
2012-12-31 0.5
2013-03-31 0.5
2013-06-30 0.5
2013-09-30 0.5
2013-12-31 0.5
2014-03-31 0.5
2014-06-30 0.5
2014-09-30 0.5
2014-12-31 0.5
2015-03-31 0.5
2015-06-30 0.5