78% (1979)

73% (1990)

60% (1999)

61% (1994)

30% (2001)

76% (1988)

75% (1984)

57% (1981)

0% (1993)

0% (1995)

64% (1979)

70% (1982)

0% (1981)

50% (1996)

0% (1994)

60% (1985)

0% (1992)

0% (2002)