55% (1984)

38% (1981)

40% (1988)

52% (1997)

52% (1984)

50% (1982)

20% (1980)

38% (1991)

60% (1995)

57% (1996)

45% (1981)

27% (1996)

54% (1990)

30% (1990)

0% (1978)

48% (1982)

45% (1982)