月份

1998

1999

2000

2001

2002

2003

2004

2005

2006

1

35.74

29.97

30.15

41.40

34.10

36.45

67.70

70.55

54.26

2

35.39

29.66

30.30

41.08

33.10

35.49

69.94

64.41

60.62

3

32.40

29.94

33.85

41.99

33.25

33.64

66.38

66.14

64.60

4

32.24

29.22

34.81

42.98

32.75

33.09

66.23

67.00

63.75

5

31.83

29.21

34.39

42.40

28.70

34.21

67.35

65.16

6

31.52

27.84

35.13

41.41

28.6

37.13

73.86

60.91

7

31.27

26.65

36.16

39.87

27.0

39.67

77.87

62.80

8

30.43

26.68

36.20

38.22

25.98

42.67

76.52

59.16

9

30.29

27.26

37.01

37.91

30.23

47.55

74.12

58.2

10

31.46

29.17

39.56

36.00

34.28

58.80

72.10

54.90

11

30.97

29.53

41.73

35.12

34.34

61.33

77.77

52.06

12

30.49

30.39

43.07

34.50

35.01

62.02

77.06

52.24