1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

JANUARY

5.00

6.03

5.69

1.82

1.36

1.12

2.67

4.60

5.36

3.92

1.21 

0.25 

FEBRUARY

4.99

6.10

5.34

1.90

1.34

1.12

2.82

4.75

5.36

3.09

1.24 

0.25 

MARCH

5.00

6.19

4.96

1.98

1.28

1.11

3.02

4.92

5.35

2.78

1.27 

0.27 

APRIL

4.99

6.31

4.61

1.96

1.30

1.15

3.15

5.07

5.35

2.79

1.26

0.31 

MAY

5.02

6.75

4.10

1.90

1.28

1.25

3.26

5.18

5.36

2.70

0.82 

0.46 

JUNE

5.17

6.79

3.83

1.87

1.12

1.41

3.42

5.38

5.36

2.77

0.62

0.54 

JULY

5.31

6.73

3.75

1.84

1.10

1.62

3.60

5.50

5.36

 2.79

0.48

AUGUST

5.45

6.69

3.56

1.77

1.13

1.72

3.79

5.42

5.48

 2.81

0.35

SEPTEMBER

5.56

6.67

3.03

1.80

1.14

1.90

3.91

5.38

5.49

 3.12

0.30

OCTOBER

6.18

6.77

2.40

1.78

1.16

2.08

4.16

5.37

5.17

 4.06

0.28 

NOVEMBER

6.10

6.75

2.10

1.45

1.17

2.30

4.34

5.37

4.95

 2.28

0.27 

DECEMBER

6.12

6.54

1.92

1.40

1.17

2.45

4.48

5.36

4.98

 1.83

0.25