(Percent per annum)
Year/ Month
1-month
3-month
6-month
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
2.10
2.59
2.79
Aug
2.98
2.80
0.12
1.12
1.65
Sep
2.61
2.66
2.72
1.69
1.59
1.60
Oct
2.68
2.93
3.20
1.75
1.45
1.37
Nov
2.25
2.46
2.73
1.14
1.25
Dec
2.67
2.51
2.83
2.05
1.40
1.38
2010
2.45
1.64
1.70
Jan
2.84
2008
Feb
2.18
2.78
2.34
2.07
1.88
Mar
3.44
3.28
3.10
-1.40
0.24
0.68
3.47
3.43
3.39
1.79
1.19
2.88
2.60
3.00
2.38
4.40
3.72
3.22
1.85
5.26
4.73
4.12
4.37
3.69
3.15
5.69
5.38
4.86
7.54
6.04
4.92
6.00
5.75
5.36
5.48
4.71
3.84
7.85
6.94
6.50
2.95
2.35
1.98
7.18
5.95
2.48
1.13
0.70
7.05
6.59
6.34
6.78
4.20
2011
5.78
4.59
6.79
6.41
6.33
6.67
6.35
4.06
8.03
7.31
6.89
2.12
7.42
7.47
7.38
5.22
3.99
6.77
6.68
6.54
3.77
3.34
2.82
6.65
6.40
3.64
3.42
2.89
6.96
6.63
6.39
Note : Market-based exchange rate system was introduced from March 1, 1993.