54% (1977)

53% (1971)

56% (1989)

40% (1981)

70% (2001)

80% (2000)

75% (1997)

73% (2000)

50% (1995)

40% (1982)

80% (1998)

70% (2003)

60% (2001)

0% (1965)

0% (1998)