2001

7.8

2005

7.1

1976

7.0

2017

6.8

1970

4.5

1955

6.8

2006

7.5

1961

6.0

1997

6.1

1965

0.0

1957

6.2

2006

6.7

2004

5.6

1984

6.3

1972

5.0

1977

5.0

1964

6.2

2014

6.2

2010

6.0

2007

6.8