1968

6.6

2009

7.2

1962

6.9

2010

6.6

1956

7.1

1995

6.2

1941

7.0

2002

7.7

1997

5.7

1947

7.0

1940

8.1

2015

6.0

1969

7.7

2015

6.6

1974

6.8

1994

8.0

1953

7.3

2011

7.1

1916

7.1

1957

6.8