54% (1977)

53% (1971)

53% (1989)

40% (1981)

70% (2001)

40% (1982)

73% (2000)

80% (1998)

80% (2000)

50% (1995)

0% (1965)

70% (2003)

75% (1997)

0% (1998)

60% (2001)