1962

7.0

1965

6.7

1977

6.8

1971

6.4

1969

5.0

2017

5.3

2009

7.1

2005

6.7

1990

7.3

1938

7.4

1996

7.0

2000

6.1

2006

6.8

1935

7.3

2001

6.0

1979

4.7

1979

6.0

1970

4.0

2002

6.7

1987

6.3