68% (1973)

73% (1983)

67% (1973)

0% (1997)

78% (1982)

78% (1994)

76% (2005)

70% (2005)

80% (1997)

63% (1980)

65% (2001)

56% (1982)

60% (2002)

75% (1991)

74% (1981)

40% (1990)

50% (1987)

60% (1990)

70% (2000)

30% (1998)