72% (1990)

60% (1999)

70% (1984)

0% (1994)

74% (1988)

50% (1996)

30% (2001)

61% (1994)

0% (1981)

0% (1995)

64% (1979)

77% (1979)

60% (1985)

60% (1982)

56% (1981)

0% (2002)

0% (1992)

0% (1993)