1955

7.1

2001

7.4

1971

6.4

1997

7.5

1980

5.0

1997

6.7

2023

0.0

1991

7.3

1980

7.1

1981

7.2

2002

5.1

1994

6.3

2000

6.5

2000

5.5

2008

6.3

2017

5.2

1968

6.5

1949

7.6

1934

6.0

1992

6.1