1937

7.1

1965

6.8

1968

6.5

1965

7.4

1968

6.7

1979

6.5

1980

6.3

1963

6.8

1967

6.7

1947

6.7

1966

7.7

2004

6.4

1982

7.1

2003

6.8

2005

6.2

1952

6.7

1961

7.8

1985

6.6

2018

6.0

1964

6.8