63% (2001)

71% (1997)

61% (1999)

67% (1991)

60% (1985)

47% (1983)

57% (1985)

62% (1998)

45% (1989)

20% (1984)

80% (1996)

43% (2003)

40% (2006)

40% (1997)

0% (1989)