月份

1997

1998

1999

2000

2001

2002

2003

2004

2005

1

41.72

35.74

29.97

30.15

41.40

34.10

36.45

67.70

70.55

2

41.01

35.39

29.66

30.30

41.08

33.10

35.49

69.94

64.41

3

41.11

32.40

29.94

33.85

41.99

33.25

33.64

66.38

66.14

4

40.82

32.24

29.22

34.81

42.98

32.75

33.09

66.23

67.00

5

39.93

31.83

29.21

34.39

42.40

28.70

34.21

67.35

65.16

6

39.12

31.52

27.84

35.13

41.41

28.6

37.13

73.86

7

38.11

31.27

26.65

36.16

39.87

27.0

39.67

77.87

8

37.75

30.43

26.68

36.20

38.22

25.98

42.67

76.52

9

37.34

30.29

27.26

37.01

37.91

30.23

47.55

74.12

10

36.98

31.46

29.17

39.56

36.00

34.28

58.80

72.10

11

36.76

30.97

29.53

41.73

35.12

34.34

61.33

77.77

12

36.38

30.49

30.39

43.07

34.50

35.01

62.02

77.06