74% (1995)

53% (1991)

81% (2004)

62% (1994)

71% (1978)

71% (1974)

62% (1996)

80% (1994)

77% (1980)

80% (2005)

59% (1983)

74% (1981)

53% (1980)

72% (1984)

50% (1982)

66% (1992)

61% (1969)

71% (2005)

74% (1983)

55% (1989)