1984

6.5

2002

4.6

1999

8.3

1994

5.7

1977

6.0

1987

5.0

1972

0.0

1991

6.5

1961

9.0

1961

5.5

2000

7.5

2005

8.1

2000

0.0

1978

0.0

1992

6.8

1987

6.5

1994

6.1

2006

7.7

1983

0.0

1990

7.3