70% (2001)

64% (1997)

47% (1994)

70% (1988)

62% (1992)

39% (1989)

37% (2001)

47% (1992)

65% (1997)

60% (1974)

62% (1968)

40% (1977)

74% (1993)

65% (1988)

44% (1987)

66% (1995)

44% (1992)

40% (1976)

38% (1982)

60% (1951)