1964

7.9

1988

5.7

1967

5.3

1987

6.8

1979

5.9

1982

7.3

1957

7.7

1986

4.8

1980

5.5

1960

6.2

1964

6.4

1995

4.5

1966

6.4

1994

7.1

1973

4.8