1971

8.2

1972

4.5

1969

6.1

1964

6.6

1965

6.3

1964

6.4

1971

6.4

1966

5.6

1970

4.6

1951

6.4

1973

5.0

1971

6.6

1966

5.8

1977

5.7

1963

6.3

1951

6.9

1954

6.7

1964

6.0

1950

6.6

1972

6.2