55% (1992)

63% (1993)

77% (1996)

58% (1998)

70% (1998)

64% (1995)

61% (1999)

66% (1997)

61% (1994)

49% (1997)

52% (1995)

63% (1998)

62% (1998)

66% (1992)

62% (1998)

58% (1995)

42% (1996)

73% (1998)

62% (1994)

63% (1996)