53% (1978)

20% (1984)

56% (1991)

20% (2005)

0% (2004)

72% (1975)

50% (1976)

40% (2005)

64% (2001)

50% (1994)

70% (1979)

65% (1998)

30% (1981)

0% (2006)

0% (1990)

60% (1978)

0% (1994)

0% (1975)

47% (1996)

38% (1991)