1971

9.5

1979

5.9

1941

6.9

1965

7.1

1976

5.6

2000

5.9

2007

7.0

2014

7.2

1995

8.0

1977

6.0

1970

6.4

2012

5.7

1994

5.8

2004

2.9

2008

6.2

1977

6.8

1983

7.3

1992

6.0

2002

7.6

2002

6.3