1991

6.7

1979

6.7

1960

0.0

1988

6.9

1979

7.3

1979

7.5

2006

6.4

1987

6.3

2009

5.5

1998

7.3

1979

7.0

1999

6.5

1999

7.4

1992

6.3

1996

6.3

1995

6.9

1987

6.3

1975

6.5

2005

5.5

2007

6.7