1982

7.6

1988

6.8

2015

4.6

1998

5.2

1976

6.7

2015

5.7

1957

7.2

2011

6.9

1965

7.4

2013

7.4

2005

7.0

1963

7.2

2001

9.9

1988

6.3

1975

7.5

1962

8.0

1961

7.7

1938

7.5

1993

6.5

1969

7.6