20% (1978)

0% (1961)

50% (1957)

30% (1975)

60% (1982)

55% (1976)

55% (1980)

20% (1964)

40% (1972)

20% (1985)

75% (1959)

0% (1964)

40% (1986)

40% (1975)

68% (1975)

55% (1964)

80% (1991)

0% (1985)

80% (1957)

70% (1959)