1992

6.3

1982

6.1

1949

7.1

2017

8.5

2007

4.5

2008

5.0

1976

5.6

1996

6.8

1972

6.9

2004

5.9

1948

6.7

1983

6.6

1943

7.5

2004

6.7

1944

6.9

1947

7.0

2009

7.3

1976

7.7

1954

6.8

2009

7.6