50% (1980)

56% (1994)

50% (1992)

70% (1985)

60% (2001)

73% (1993)

58% (2003)

71% (2003)

77% (1987)

47% (1985)

40% (1981)

54% (1998)

62% (1993)

59% (2000)

70% (1986)

73% (1994)

42% (1991)

48% (2001)

48% (1993)

50% (2003)