59% (1989)

73% (1993)

69% (1992)

59% (1990)

70% (1998)

74% (1986)

64% (2000)

74% (1994)

59% (1994)

66% (1995)

67% (1990)

74% (1999)

64% (1992)

67% (1995)

63% (1992)

66% (1987)

62% (1991)

55% (1988)

60% (1987)

73% (1999)