72% (1990)

70% (1984)

61% (1994)

77% (1979)

60% (1999)

30% (2001)

74% (1988)

0% (1995)

56% (1981)

64% (1979)

0% (2002)

0% (1993)

60% (1982)

60% (1985)

0% (1994)

50% (1996)

0% (1992)

0% (1981)