1975

5.8

2017

6.7

1997

7.0

2003

5.4

0.0

2000

7.3

2002

6.6

1988

7.5

2002

7.3

1987

8.1

1958

7.7

2006

6.9

1971

7.6

2006

6.4

1918

0.0

1998

6.8

1962

7.3

1958

7.5

2004

6.5

2000

6.4