Quarterly Percent
1987-03-31 7.68
1987-09-30 8.25
1987-12-31 7.28
1988-03-31 6.8
1988-06-30 7.82
1988-09-30 8.56
1988-12-31 9.2
1989-03-31 10.2
1989-06-30 9.19
1989-09-30 9.08
1989-12-31 8.26
1990-03-31 8.39
1990-06-30 8.27
1990-09-30 8.2
1990-12-31 7.46
1991-03-31 6.27
1991-06-30 6.09
1991-09-30 5.55
1991-12-31 4.16
1992-03-31 4.27
1992-06-30 3.85
1992-09-30 3.17
1992-12-31 3.34
1993-03-31 3.16
1993-06-30 3.22
1993-09-30 3.28
1993-12-31 3.29
1994-03-31 3.84
1994-06-30 4.78
1994-09-30 5.41
1994-12-31 6.41
1995-03-31 6.16
1995-06-30 5.96
1995-09-30 5.87
1995-12-31 5.54
1996-03-31 5.37
1996-06-30 5.5
1996-09-30 5.53
1996-12-31 5.47
1997-03-31 5.68
1997-06-30 5.68
1997-09-30 5.67
1997-12-31 5.7
1998-03-31 5.62
1998-06-30 5.62
1998-09-30 5.21
1998-12-31 4.98
1999-03-31 4.89
1999-06-30 5.25
1999-09-30 6
1999-12-31 5.92
2000-03-31 6.23
2000-06-30 6.72
2000-09-30 6.74
2000-12-31 6.34
2001-03-31 4.82
2001-06-30 3.8
2001-09-30 2.53
2001-12-31 1.81
2002-03-31 1.97
2002-06-30 1.8
2002-09-30 1.73
2002-12-31 1.32
2003-03-31 1.23
2003-06-30 1.06
2003-09-30 1.1
2003-12-31 1.1
2004-03-31 1.06
2004-06-30 1.57
2004-09-30 1.97
2004-12-31 2.51
2005-03-31 3.08
2005-06-30 3.49
2005-09-30 4.02
2005-12-31 4.5
2006-03-31 4.97
2006-06-30 5.45
2006-09-30 5.33
2006-12-31 5.31
2007-03-31 5.3
2007-06-30 5.33
2007-09-30 5.28
2007-12-31 4.71
2008-03-31 2.72
2008-06-30 2.83
2008-09-30 4.5
2008-12-31 1.5
2009-03-31 1.2
2009-06-30 0.6
2009-09-30 0.3
2009-12-31 0.25
2010-03-31 0.29
2010-06-30 0.59
2010-09-30 0.3
2010-12-31 0.37
2011-03-31 0.31
2011-06-30 0.25
2011-09-30 0.37
2011-12-31 0.58
2012-03-31 0.53
2012-06-30 0.46
2012-09-30 0.36
2012-12-31 0.31
2013-03-31 0.285