Month	Percent
1991-07-01	67.60
1991-08-01	66.84
1991-09-01	66.84
1991-10-01	72.36
1991-11-01	75.04
1991-12-01	68.44
1992-01-01	67.72
1992-02-01	67.64
1992-03-01	67.64
1992-04-01	68.44
1992-05-01	70.12
1992-06-01	74.32
1992-07-01	76.40
1992-08-01	75.40
1992-09-01	74.40
1992-10-01	74.40
1992-11-01	74.60
1992-12-01	74.76
1993-01-01	74.76
1993-02-01	69.64
1993-03-01	65.32
1993-04-01	65.92
1993-05-01	67.12
1993-06-01	66.84
1993-07-01	66.84
1993-08-01	65.76
1993-09-01	64.76
1993-10-01	63.04
1994-03-01	99.00
1994-05-01	160
1994-06-01	114.52
1994-07-01	98.76
1994-08-01	88.96
1994-09-01	87.37
1994-10-01	82.28
1994-11-01	94.08
1994-12-01	105.92
1995-01-01	108.07
1995-04-01	77.37
1995-05-01	80.94
1995-06-01	71.93
1995-07-01	66.98
1995-08-01	69.99
1995-10-01	92.24
1995-11-01	97.99
1995-12-01	128.99
1996-01-01	111.99
1996-03-01	103.62
1996-05-01	85.68
1996-07-01	95.58
1997-10-01	98.69
1997-12-01	102.83
1998-02-01	99.33
1998-03-01	89.14
1998-08-01	81.00
1999-07-01	75.06
1999-08-01	75.56
1999-10-01	73.08
1999-11-01	71.66
2000-01-01	34.07
2000-02-01	36.36
2000-04-01	33.30
2000-05-01	35.02
2000-07-01	28.72
2000-08-01	28.24
2000-10-01	35.77
2000-11-01	35.20
2001-01-01	47.99
2001-02-01	57.03
2001-03-01	124.99
2001-04-01	82.00
2001-05-01	69.48
2001-06-01	63.34
2001-07-01	70.78
2001-08-01	74.49
2001-10-01	62.43
2001-11-01	59.61
2001-12-01	57.42
2002-01-01	58.25
2002-02-01	55.92
2002-03-01	53.95
2002-04-01	44.49
2002-05-01	46.35
2002-06-01	56.50
2002-07-01	51.89
2002-08-01	48.99
2002-09-01	49.27
2002-10-01	46.68
2002-11-01	41.20
2002-12-01	39.28
2003-01-01	43.00
2003-02-01	40.60
2003-03-01	48.70
2003-04-01	39.96
2003-05-01	36.62
2003-06-01	34.71
2003-07-01	32.00
2003-08-01	30.60
2003-09-01	27.73
2003-10-01	23.80
2003-11-01	23.75
2003-12-01	23.50
2004-01-01	25.25
2004-02-01	23.30
2004-03-01	22.06
2004-04-01	21.57
2004-05-01	24.49
2004-06-01	22.90
2004-07-01	23.04
2004-08-01	22.55
2004-09-01	19.18
2004-10-01	19.59
2004-11-01	19.58
2004-12-01	19.87
2005-01-01	17.25
2005-02-01	16.31
2005-03-01	15.34
2005-04-01	14.87
2005-06-01	14.13
2005-07-01	14.37
2005-09-01	13.50
2005-10-01	13.78
2005-12-01	14.00
2006-03-01	13.56
2006-06-01	15.76
2006-07-01	20.86
2006-10-01	18.38
2006-12-01	18.78
2007-04-01	17.86
2007-07-01	16.12
2007-10-01	16.14
2008-01-01	15.38
2008-04-01	16.65