1989

6.7

2014

5.8

1951

6.1

1943

6.0

1997

4.8

1993

7.5

1988

6.8

2017

5.3

2014

7.3

2001

7.5

2009

6.0

2011

6.1

2011

6.0

1985

8.1

2003

6.0

1940

6.5

2005

6.5

1974

3.6

1968

0.0

2002

3.5