64% (1973)

63% (1992)

68% (1988)

52% (1995)

66% (1980)

40% (1972)

63% (1966)

49% (1974)

63% (1968)

64% (1973)

50% (2003)

52% (1986)

40% (1973)

50% (1971)

60% (1971)

60% (1971)

48% (1974)

50% (1969)

70% (1966)

37% (1965)