1962

8.0

1987

8.1

2005

7.1

2006

6.1

2007

6.8

1991

6.4

1991

6.7

1995

8.1

2004

6.3

1994

0.0

1975

7.0

1993

7.9

1982

6.1

2002

6.5

1996

6.9

1940

4.3

1995

6.0

1998

7.7

2013

7.1

1980

2.0