1965

7.0

2007

6.0

1989

7.3

2007

6.4

2001

7.5

1994

6.9

2001

6.1

1960

7.6

1995

8.0

1955

7.2

1912

6.3

2008

5.3

2008

5.7

1931

6.9

2003

6.4

2006

4.6

2002

5.8

2007

5.6

1998

7.0

1950

6.5