1978

6.7

2007

6.5

2001

6.1

1949

0.0

1993

7.4

1970

7.5

1979

7.1

0.0

1987

7.3

1995

6.5

1961

8.1

2002

7.7

1997

6.6

1965

6.8

2005

6.2

1946

7.3

0.0

2007

6.8

1964

7.4

2003

7.6