1965

8.0

1972

8.6

1974

6.0

1967

7.7

1969

7.1

1973

6.9

1960

6.4

1958

5.3

1964

6.6

1961

6.2

1967

5.7

1971

5.5

1968

5.3

1971

6.8

1964

7.2