1985

6.2

1970

7.1

2003

6.6

2017

5.7

1988

7.2

1937

7.9

1957

8.3

1991

6.3

1984

6.7

2001

6.4

2004

6.7

1961

6.8

1960

4.5

1928

0.0

1937

5.5

1998

6.3

1968

6.3

2016

9.3

1945

5.0

1973

6.8