20% (1996)

62% (1993)

35% (1999)

35% (1980)

20% (2002)

85% (1994)

45% (1985)

20% (1993)

35% (2001)

20% (1989)

50% (1981)

50% (1980)

28% (2007)

0% (1987)

20% (1984)

20% (1998)

20% (1975)

20% (1982)

20% (1997)

20% (1997)