49% (1991)

47% (1980)

49% (1990)

49% (1987)

54% (1983)

59% (1987)

61% (1987)

49% (1989)

44% (1986)

29% (1988)

23% (1986)

61% (1985)

40% (1985)

54% (1980)

44% (1980)

20% (1992)

50% (1989)

32% (1988)

64% (1986)

52% (1988)