1979

5.0

2017

4.5

1966

4.4

1944

7.0

2005

5.8

1997

6.2

1998

6.3

1993

6.7

1969

7.0

2002

6.4

1997

6.6

2007

6.7

1988

7.8

1968

7.2

2003

6.1

1996

6.9

2008

6.7

1995

6.9

1972

0.0

1991

6.4