1981

6.7

1973

6.0

1975

4.5

1984

6.7

1963

8.0

1989

7.2

1986

7.3

1979

6.8

2006

6.6

1997

6.7

2006

7.4

2001

5.4

2000

7.2

1998

6.8

1965

0.0

1993

5.2

2000

0.0

1979

6.7

1991

6.4

1963

8.2