62% (1986)

10% (1991)

60% (2001)

79% (1992)

59% (2000)

40% (1981)

70% (1990)

55% (1990)

63% (1991)

48% (1993)

56% (1991)

73% (1994)

48% (2001)

75% (1995)

47% (1994)

62% (2003)

69% (1986)

40% (2001)

42% (1991)

77% (1987)