65% (1973)

63% (1992)

52% (1995)

68% (1988)

49% (1974)

50% (1982)

40% (1972)

64% (1973)

60% (1971)

66% (1980)

63% (1968)

30% (1992)

52% (1986)

60% (1971)

40% (1973)

63% (1966)

50% (1969)

60% (1975)

50% (2003)

50% (1971)