66% (1997)

52% (2004)

67% (1999)

68% (2000)

55% (1988)

67% (1999)

60% (1996)

65% (1994)

58% (1979)

62% (1996)

30% (1982)

52% (1986)

17% (1997)

57% (1996)

70% (1978)

62% (1977)

0% (1978)

0% (1978)

87% (1980)

20% (1980)