1946

7.6

1999

6.7

1995

7.9

1941

7.7

1986

7.6

1995

8.4

1968

7.3

1944

7.2

2014

8.7

1982

6.2

1949

7.5

1996

4.8

1940

6.0

1994

6.7

1934

6.0

2002

6.2

1978

6.3

2006

5.3

2001

5.5

2007

6.1