1983

5.5

1982

4.6

2014

5.8

1941

6.3

2011

6.0

2001

7.5

2011

6.1

0.0

2012

7.8

2017

5.2

1968

0.0

1988

6.8

2014

5.3

1989

6.7

1951

6.1

2007

3.8

2019

8.0

1997

5.0

1993

7.5

2005

6.5