1999

6.4

1970

6.6

1998

7.1

1960

8.0

1955

6.0

1968

6.5

1999

6.1

1963

7.7

1934

7.0

2005

6.8

2003

6.1

1998

5.1

2017

6.0

1956

6.9

2005

6.7

1996

6.9

2000

5.8

1935

4.5

1938

5.0

1962

6.4