1998

8.3

2008

6.1

1963

6.4

2005

7.1

2001

6.9

1976

6.4

2003

7.0

1998

6.5

1978

6.5

2009

7.0

2006

7.3

1975

6.6

2015

6.6

2017

6.1

1973

6.1

1996

6.4

1988

6.3

1981

3.3

1943

6.9

2005

0.0