60% (2012)

47% (2009)

35% (2004)

56% (1978)

61% (2005)

50% (1988)

45% (1992)

20% (1984)

50% (1989)

20% (1990)

45% (1996)

20% (1997)

0% (1975)

20% (1972)

20% (1979)

60% (2007)

20% (1982)

35% (1987)

42% (1976)

52% (1999)