(Per cent per annum)

2010

2012

Apr

3.47

3.43

3.39

Jun

7.48

6.87

5.90

May

3.44

2.88

2.60

Jul

7.93

7.21

6.52

Jun

4.40

3.72

3.22

Aug

7.84

7.37

6.86

Jul

5.26

4.73

4.12

Sep

7.41

6.90

6.51

Aug

5.69

5.38

4.86

Oct

7.54

6.78

6.33

Sep

6.00

5.75

5.36

Nov

7.04

6.42

6.06

Oct

7.85

6.94

6.50

Dec

7.53

6.74

6.57

Nov

7.18

6.50

5.95

2013

Dec

7.05

6.59

6.34

Jan

7.43

7.17

6.71

2011

Feb

7.01

7.76

7.24

Jan

6.79

6.78

6.41

Mar

8.79

7.87

7.27

Feb

6.33

6.66

6.35

Apr

7.74

7.50

7.18

Mar

8.03

7.31

6.89

May

7.21

6.85

6.46

Apr

7.42

7.48

7.38

Jun

6.86

6.35

5.90

May

6.77

6.68

6.54

Jul

8.36

7.83

7.47

Jun

6.65

6.67

6.40

Aug

10.35

9.52

8.71

Jul

6.96

6.63

6.39

Sep

10.65

9.56

8.55

Aug

3.69

4.13

3.94

Oct

9.24

9.12

8.46

Sep

4.64

4.35

3.41

Nov

9.08

8.93

8.55

Oct

5.92

4.95

3.83

Dec

9.28

8.78

8.58

Nov

6.74

5.20

4.24

2014

Dec

8.04

6.64

5.96

Jan

8.60

8.52

8.17

2012

Feb

8.31

8.79

8.44

Jan

8.89

7.81

6.80

Mar

10.54

9.26

8.74

Feb

8.94

8.31

7.18

Apr

8.64

8.46

8.41

Mar

10.09

8.55

7.40

May

8.43

8.28

8.11

Apr

8.58

7.73

7.05

Jun

8.74

8.75

8.71

May

7.93

7.22

6.35

Jul

8.92

8.73

8.70

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