30% (1971)

62% (1994)

37% (1976)

60% (2000)

66% (1975)

60% (1994)

40% (2002)

82% (1982)

40% (1969)

65% (2001)

68% (1969)

60% (1978)

52% (1980)

60% (2004)

40% (2002)

50% (1970)

61% (2001)

80% (1969)

87% (2004)

68% (1971)