1977

4.8

2014

6.1

2008

5.2

1997

5.0

2004

6.2

1989

6.8

2004

6.5

1997

5.0

2004

6.2

1955

6.9

1996

6.0

1983

7.1

2003

5.8

2022

4.9

1913

0.0

1994

5.3

2003

5.7

2008

6.5

1999

6.0

1985

6.2