52% (1993)

57% (1991)

35% (1989)

58% (1994)

51% (1995)

36% (1993)

48% (1992)

43% (1991)

42% (1993)

40% (1995)

46% (1992)

45% (1995)

40% (1995)

45% (1993)

40% (1992)

30% (1994)

37% (1990)

54% (1994)

41% (1994)

32% (1993)