20% (1998)

20% (1980)

20% (2002)

0% (1975)

52% (1999)

53% (2003)

35% (1980)

20% (1990)

45% (1996)

0% (1975)

50% (1993)

53% (1970)

35% (2001)

20% (1986)

0% (1997)

0% (1981)

20% (1977)

40% (2012)

70% (1994)

20% (1977)