1965

6.7

1977

6.8

1981

6.5

1960

8.1

1972

7.1

1987

4.1

2007

6.5

1997

7.7

1989

7.4

2002

6.0

1977

6.0

1958

6.5

1954

6.8

1943

6.1

2001

7.0

1940

7.1

2014

5.3

2011

5.0

1989

7.3

1983

5.5