月份

1998

1999

2000

2001

2002

2003

2004

1

34.54

27.79

28.08

36.65

31.95

32.94*

60.12*

2

34.35

27.59

27.96

37.74

33.25

32.51*

64.95*

3

33.06

27.69

28.88

39.09

33.62

31.78*

71.69*

4

31.50

27.49

28.99

39.70

33.05

31.16*

69.55*

5

31.43

28.31

29.50

39.87

28.30

31.63*

72.50*

6

29.09

27.21

30.22

38.17

28.55

33.93*

71.47*

7

27.20

27.09

31.42

37.26

27.05

35.07*

73.19*

8

26.31

27.28

32.02

35.16

26.60

35.85*

9

25.54

26.24

34.98

35.05

27.88

36.71*

10

26.13

29.50

35.51

34.93

29.2

45.77*

11

27.11

28.69

35.80

32.05

30.93

49.65*

12

27.45

28.93

37.75

31.05

31.95

53.20*