57% (1988)

42% (1992)

64% (1979)

43% (1994)

37% (1985)

52% (1983)

20% (1987)

52% (1980)

60% (1979)

48% (1982)

20% (1979)

35% (1983)

54% (1984)

0% (1988)

66% (1981)

55% (1990)