1980

7.3

2009

1.0

2001

6.5

1921

8.2

1991

5.9

2014

7.0

1997

6.1

1995

6.9

1997

5.1

1965

5.6

2007

5.5

1946

5.7

2005

7.0

1998

6.3

2005

5.4

2017

6.8

2005

7.5

2020

0.0

1999

6.9

1996

5.7