1986

6.9

2007

8.0

2008

7.0

2006

6.7

1967

7.4

2007

5.3

2006

7.4

2005

7.6

1958

6.2

2000

6.8

1937

0.0

2000

7.0

2008

5.4

1994

6.1

2011

6.1

2006

7.3

2013

7.8

1995

6.4

2003

5.6

2024

6.3