1997

6.6

1971

6.8

1964

7.8

1964

7.1

1954

8.0

1999

5.5

1973

7.4

1992

7.4

1944

7.6

1991

6.2

1943

6.0

1951

6.9

2009

5.5

1991

8.3

2003

6.5

1946

7.7

2006

5.5

1955

7.3

1936

6.1

1999

5.9