1997

6.6

1991

8.3

1992

7.4

1944

7.6

1968

7.2

1995

7.9

1979

7.2

1995

7.3

2000

6.2

1996

6.0

2004

6.0

2014

5.8

1992

6.0

1967

6.5

2007

6.3

1987

6.0

1946

6.5

1995

6.3

2002

5.6

1985

6.1