35% (2007)

36% (2003)

54% (1999)

40% (2004)

40% (1999)

60% (1996)

60% (1999)

0% (1991)

0% (1984)

20% (1985)

0% (1991)

20% (1983)

0% (1993)

10% (1995)

60% (1997)

57% (2004)

10% (1992)

20% (1991)

0% (1985)

10% (2001)