50% (1973)

20% (2006)

70% (2000)

49% (1990)

35% (2001)

20% (1988)

20% (1994)

20% (1990)

50% (1989)

40% (2012)

20% (1979)

20% (1976)

20% (1994)

20% (1999)

0% (1987)

20% (1982)

0% (2002)

0% (1991)

35% (1999)

47% (2005)