Quarter	Percent
1988-03-31	14
1988-06-30	12.8
1988-09-30	13.4
1988-12-31	9.6
1989-03-31	8.4
1989-06-30	7.1
1989-09-30	7.2
1989-12-31	6.9
1990-03-31	11.5
1990-06-30	11.7
1990-09-30	12.5
1990-12-31	14.1
1991-03-31	8.9
1991-06-30	8.2
1991-09-30	5.2
1991-12-31	4
1992-03-31	5
1992-06-30	4.2
1992-09-30	2.9
1992-12-31	1.4
1993-03-31	1.4
1993-06-30	2.2
1993-09-30	3.8
1993-12-31	8
1994-03-31	7.1
1994-06-30	10.3
1994-09-30	12.3
1994-12-31	14.2
1995-03-31	17
1995-06-30	16.9
1995-09-30	16.7
1995-12-31	17.7
1996-03-31	18
1996-06-30	18.9
1996-09-30	20.7
1996-12-31	22.4
1997-03-31	23.2
1997-06-30	21.9
1997-09-30	21.6
1997-12-31	22.2
1998-03-31	23.9
1998-06-30	25.5
1998-09-30	26.7
1998-12-31	25.7
1999-03-31	25.6
1999-06-30	23.7
1999-09-30	21.8
1999-12-31	20.3
2000-03-31	20.9
2000-06-30	22
2000-09-30	21.9
2000-12-31	20.6
2001-03-31	18.9
2001-06-30	18.1
2001-09-30	16.7
2001-12-31	16.8
2002-03-31	18.5
2002-06-30	17.8
2002-09-30	19.9
2002-12-31	18.3
2003-03-31	18.9
2003-06-30	21.2
2003-09-30	21.3
2003-12-31	20.7
2004-03-31	21.5
2004-06-30	20.3
2004-09-30	20.6
2004-12-31	20.9
2005-03-31	20.4
2005-06-30	17.5
2005-09-30	14.2
2005-12-31	11.4
2006-03-31	8.7
2006-06-30	6.9
2006-09-30	4.6
2006-12-31	3.6
2007-03-31	2.6
2007-06-30	1.6
2007-09-30	3
2007-12-31	4.2
2008-03-31	5.5
2008-06-30	7.5
2008-09-30	8.6
2008-12-31	7.8
2009-03-31	7.5
2009-06-30	6.2
2009-09-30	4.3
2009-12-31	4.3
2010-03-31	4.1