1974

4.7

1971

6.9

1974

7.2

1968

6.4

1971

6.4

1974

6.4

1965

5.2

1972

5.8

1973

7.0

1964

6.1

1959

5.0

1971

5.0

1966

6.5

1960

7.5

1964

3.8

1990

3.0

1967

4.9

1961

5.0

1972

7.4