1985

7.1

1997

6.8

2004

7.6

1993

5.7

1974

6.7

1973

6.9

1934

6.1

2023

5.2

2005

7.5

2006

4.0

1996

5.9

1969

7.0

1988

6.3

1979

7.5

1988

7.6

1981

6.7

1986

6.0

2015

7.6

1933

0.0

1955

6.5