1996

7.5

2006

6.3

1966

6.3

1975

6.9

1942

5.8

1956

6.2

1970

6.0

1988

7.6

1941

7.4

1964

7.0

1990

6.1

2000

7.7

2005

5.7

1978

7.4

1951

5.8

1977

7.6

2012

6.5

1920

7.9

1997

6.3

1989

6.3