1988

7.2

1970

7.1

1983

6.9

2005

8.1

1989

7.5

2006

6.6

2005

6.4

1996

3.6

1962

7.0

1995

6.7

1959

7.5

1986

7.4

1935

7.4

1983

0.0

1985

5.4

1996

7.0

2008

7.0

2013

7.2

1994

6.8

2006

6.6