(Percent per annum)

Year/ Month

1-month

3-month

6-month

Year/ Month

1-month

3-month

6-month

1

2

3

4

1

2

3

4

2007

2009

Apr

8.13

6.91

5.93

Jun

3.46

3.29

2.86

May

4.26

4.58

4.48

Jul

2.69

2.57

2.43

Jun

2.10

2.59

2.79

Aug

2.98

2.80

2.69

Jul

0.12

1.12

1.65

Sep

2.61

2.66

2.72

Aug

1.69

1.59

1.60

Oct

2.68

2.93

3.20

Sep

1.75

1.45

1.37

Nov

2.25

2.46

2.73

Oct

1.14

1.12

1.25

Dec

2.67

2.51

2.83

Nov

2.05

1.40

1.38

2010

Dec

2.45

1.64

1.70

Jan

2.83

2.93

2.84

2008

Feb

2.18

2.78

2.67

Jan

2.34

2.07

1.88

Mar

3.44

3.28

3.10

Feb

-1.40

0.24

0.68

Apr

3.47

3.43

3.39

Mar

1.79

1.25

1.19

May

3.44

2.88

2.60

Apr

3.00

2.68

2.38

Jun

4.40

3.72

3.22

May

3.29

2.45

1.85

Jul

5.26

4.73

4.12

Jun

4.37

3.69

3.15

Aug

5.69

5.38

4.86

Jul

7.54

6.04

4.92

Sep

6.00

5.75

5.36

Aug

5.48

4.71

3.84

Oct

7.85

6.94

6.50

Sep

2.95

2.35

1.98

Nov

7.18

6.50

5.95

Oct

2.48

1.13

0.70

Dec

7.05

6.59

6.34

Nov

6.78

4.20

2.66

2011

Dec

5.78

4.59

3.22

Jan

6.79

6.78

6.41

2009

Feb

6.33

6.67

6.35

Jan

4.06

3.10

2.35

Mar

8.03

7.31

6.89

Feb

3.20

2.68

2.12

Apr

7.42

7.47

7.38

Mar

5.22

3.99

3.20

May

6.77

6.68

6.54

Apr

3.77

3.34

2.82

Jun

6.65

6.67

6.40

May

3.64

3.42

2.89

Jul

6.96

6.63

6.39

Note : Market-based exchange rate system was introduced from March 1, 1993.