60% (1992)

50% (1991)

20% (1998)

73% (2008)

45% (2001)

0% (2002)

59% (2008)

47% (1990)

40% (2000)

64% (2005)

80% (1998)

0% (1979)

0% (1971)

0% (1982)

0% (2008)

53% (1988)

0% (1980)

55% (2002)

61% (2000)

55% (1977)