68% (1987)

50% (1980)

73% (1990)

62% (1993)

47% (1994)

70% (1985)

68% (1994)

70% (2003)

73% (1993)

77% (1987)

70% (1986)

69% (1986)

70% (1992)

56% (1994)

60% (1993)

30% (1999)

66% (2001)

47% (1985)

62% (1986)

74% (1991)