52% (1985)

53% (1988)

51% (1987)

40% (1990)

36% (1989)

58% (1991)

49% (1988)

47% (1986)

51% (1986)

48% (1988)

66% (1987)

40% (1982)

46% (1985)

54% (1981)

44% (1994)

46% (1991)

54% (1980)

44% (1986)

35% (1990)

45% (1986)