1980

7.9

2004

6.6

2004

6.3

1962

7.6

1989

6.9

1956

7.6

1981

3.0

1967

7.3

1972

6.2

1993

7.4

2004

8.1

1959

7.8

1992

6.9

2003

7.4

2001

6.2

1954

8.0

1947

6.5

1950

8.3

1978

7.4

1997

7.6