63% (2001)

61% (1999)

71% (1997)

66% (1991)

60% (1985)

62% (1998)

47% (1983)

57% (1985)

45% (1989)

43% (2003)

20% (1984)

40% (2006)

0% (1989)

40% (1997)

80% (1996)