73% (2008)

64% (1996)

77% (2010)

45% (1975)

67% (2011)

67% (1977)

69% (1988)

64% (1980)

55% (1974)

70% (1976)

50% (1986)

0% (1981)

50% (1998)

80% (1982)

50% (1986)

0% (1978)

0% (1981)

50% (1997)

50% (1992)

0% (1984)