1980

6.7

1987

7.5

1965

7.9

1988

7.6

1985

6.2

1976

7.3

1962

7.8

2016

5.9

1981

6.1

2006

7.0

1953

7.7

2014

7.0

1996

6.7

1949

7.8

1982

6.2

2005

6.4

1998

6.0

1948

7.3

1990

6.1

2014

5.7