1969

4.0

2006

5.1

2007

6.0

1997

6.7

2002

5.9

2015

3.2

1991

6.8

2006

4.9

1920

0.0

1980

7.3

1939

7.5

1953

6.9

1988

3.3

2008

5.3

2000

6.8

1993

7.2

1941

7.1

1990

5.8

2002

5.9

1937

5.0