58% (1995)

77% (1996)

62% (1998)

55% (1992)

63% (1995)

67% (1993)

59% (1991)

70% (1998)

57% (1997)

63% (1993)

55% (1995)

61% (2000)

62% (1994)

52% (1995)

62% (1995)

66% (1997)

55% (1996)

60% (1994)

58% (1998)

61% (1999)