1973

6.2

1964

6.5

2005

6.7

2000

7.1

1951

5.8

2005

6.1

1957

5.2

1994

4.1

1962

6.2

2001

6.0

2017

5.8

1949

5.4

2018

4.4

1969

7.8

1949

6.2

1968

5.7

1947

5.5

1972

5.8

1939

6.1

1949

6.9