1967

7.3

1976

7.3

1982

6.8

1995

7.0

2010

0.0

1970

7.1

1987

6.9

2008

6.3

2006

5.1

2013

8.5

1950

7.6

2007

7.1

1955

5.0

2007

6.8

1994

0.0

2014

5.9

2014

7.7

1969

4.2

1986

7.2

1997

7.6