1955

7.7

1966

7.3

2005

8.2

1992

7.4

1959

6.8

1970

6.0

1971

6.4

1984

7.1

2000

6.7

1960

7.7

1953

7.0

1984

7.6

1966

6.0

2000

6.8

1953

5.5

1976

5.2

1964

0.0

1977

4.8

1972

2.0