60% (1996)

54% (1999)

25% (2005)

40% (2004)

20% (1985)

60% (1999)

36% (2003)

35% (2007)

40% (1999)

0% (1985)

0% (1993)

20% (1989)

0% (1991)

35% (1990)

10% (2001)

0% (1991)

0% (1985)

0% (1992)

0% (1988)

10% (1995)