1987

0.0

1983

5.9

1993

5.7

1989

6.8

1985

7.3

2011

8.2

1970

5.0

1995

6.0

1991

5.9

1990

6.5

1990

7.4

1985

7.7

1984

0.0

1988

5.0

2001

3.0