30% (1994)

51% (1993)

40% (1995)

59% (1994)

54% (1994)

48% (1992)

46% (1992)

27% (1992)

38% (1989)

37% (1993)

59% (1992)

45% (1993)

36% (1990)

48% (1992)

47% (1993)

47% (1989)

42% (1993)

40% (1995)

45% (1995)

39% (1990)