75% (1992)

57% (1981)

66% (1996)

72% (1991)

64% (1999)

66% (1997)

33% (1978)

65% (2007)

72% (1992)

68% (1986)

73% (1978)

67% (1995)

66% (1985)

76% (1985)

72% (2004)

62% (1993)

51% (1992)

59% (1997)

61% (2003)

57% (1986)