1981

6.4

1938

7.5

1976

6.5

1987

7.3

1997

6.2

1985

6.6

1992

7.5

1999

6.0

2005

5.6

2004

7.1

1991

7.7

2003

6.7

1998

7.2

1989

6.3

2008

6.7

2024

6.9

1956

7.1

2011

9.0

2016

7.7

1946

8.3