51% (2005)

49% (2005)

50% (1987)

61% (1981)

50% (1979)

52% (1980)

65% (1982)

40% (1984)

43% (1980)

60% (1991)

53% (1986)

0% (1975)

66% (1983)

60% (1991)

62% (1982)

59% (1982)

58% (1982)

60% (1985)

40% (1991)

0% (1989)