1981

6.7

1992

5.6

1983

8.0

1985

5.5

1978

0.0

1978

7.3

1957

5.0

2004

7.6

1995

7.0

1986

7.3

1997

7.5

1972

5.0

2006

6.8

1961

7.7

2001

5.6

2002

7.9

1979

6.5

1971

7.3

2005

5.7

1997

6.8

2005

6.0