40% (1988)

44% (2001)

58% (1994)

43% (1992)

67% (1992)

53% (1995)

45% (1994)

52% (1991)

44% (1998)

43% (1989)

43% (1996)

55% (1993)

59% (1993)

56% (1993)

41% (1997)

47% (1994)

70% (1997)

35% (1997)

57% (1996)

30% (1989)