1972

6.8

1968

6.3

1993

7.3

1997

6.3

1928

7.6

1970

5.4

1966

6.3

1966

6.2

1965

6.0

1953

6.6

1963

6.5

1952

7.2

1989

6.0

1996

5.9

1991

6.1

1941

5.1

1987

5.8

2010

4.8

1990

6.2

1975

6.8