1991

6.2

1990

6.7

1993

5.5

2001

7.1

2008

5.2

2003

7.2

1966

6.4

1982

5.6

1974

4.8

1939

5.8

1941

6.2

2023

6.0

2007

6.1

2014

6.4

1986

6.8

1994

6.2

1976

7.3

2006

6.1

1983

5.5

1999

6.0