68% (1987)

73% (1990)

62% (1993)

50% (1980)

68% (1994)

47% (1994)

77% (1987)

30% (1999)

47% (1985)

70% (2003)

56% (1994)

70% (1985)

48% (1993)

69% (1986)

70% (1986)

50% (1992)

51% (1997)

73% (1993)

58% (2003)

77% (1987)