1968

6.9

1955

6.2

2005

7.4

1962

7.9

1980

6.0

2010

7.3

1972

7.8

1987

5.5

1959

8.1

1968

7.6

1922

7.2

1965

7.5

1986

7.0

1990

5.8

2012

7.8

1981

6.7

2003

7.1

1971

7.1

2017

6.0

1965

7.4