46% (1994)

55% (1996)

58% (1999)

41% (1992)

58% (1991)

44% (1995)

45% (1993)

55% (1995)

33% (1998)

55% (1990)

49% (1994)

50% (1992)

42% (1989)

53% (1993)

29% (1997)

33% (1997)

25% (1990)

62% (1989)

47% (1998)

37% (1997)