1971

7.1

1981

6.1

1976

2.2

1968

5.8

1971

6.5

1984

6.1

1986

6.8

1958

6.2

1950

6.0

1990

6.3

1970

8.2

1972

5.8

1969

5.2

1966

6.2

1970

7.2

1977

6.4

1971

6.7

1954

5.7

1972

2.8

1991

0.0

1970

5.5