1992

7.9

2001

6.0

2004

4.8

1991

5.4

2000

4.9

1976

7.4

1990

6.5

1994

6.1

1975

6.3

1970

7.5

1975

5.3

1939

7.6

1966

8.5

1968

8.3

1969

7.6

1995

7.3

1965

8.0

1935

0.0

1950

5.0

1965

6.3