51% (1993)

57% (1991)

58% (1992)

37% (1993)

54% (1994)

59% (1994)

46% (1995)

30% (1994)

42% (1995)

45% (1993)

38% (1989)

36% (1990)

49% (1992)

45% (1991)

53% (1995)

42% (1993)

39% (1990)

47% (1993)

40% (1995)

48% (1992)