1961

7.9

1966

6.6

1975

7.2

1976

6.7

1964

7.5

1948

7.2

1999

7.5

1927

8.1

2009

6.0

1952

6.7

1990

6.1

1969

7.6

1988

7.6

1965

6.7

1959

7.1

1976

7.1

1990

6.3

1994

7.5

1924

7.1

1968

6.9