YEAR

AVERAGE HUB HEIGHT^a (metres; full certainty)

STANDARD DEVIATION

AVERAGE HUB HEIGHT^b (metres; partial certainty)

STANDARD DEVIATION

1983

22.80

0.00

n/a

n/a

1984

24.00

0.00

24

.00

1985

24.39

0.29

n/a

n/a

1986

n/a

25.31

6.80

1987

n/a

n/a

n/a

1988

23.00

.00

n/a

n/a

1989

n/a

n/a

n/a

n/a

1990

n/a

n/a

29.32

2.76

1991

n/a

n/a

n/a

n/a

1992

43.00

.

40

.

1994

n/a

n/a

40

.00

1995

39.77

1.52

25

.

1996

50.00

.

n/a

n/a

1997

30.50

0.00

44.04

6.33

1998

52.29

3.56

n/a

n/a

1999

57.23

7.23

61.05

6.90

2000

57.56

9.29

30.00

.

2001

57.10

7.81

65.41

5.79

2002

62.74

5.83

53.25

37.83

2003

66.70

7.38

70.94

7.56

2004

67.63

9.39

63.32

2.43

2005

75.24

8.06

74.91

9.72