2006

5.7

1960

6.9

1997

7.5

1978

5.9

1975

6.6

1920

6.9

1939

6.7

1971

5.5

1964

6.1

1934

7.5

1970

5.9

1972

4.8

1998

6.5

1932

7.3

1980

6.7

2005

4.5

1976

7.4

2006

5.6

1948

7.9

2004

6.5