63% (1975)

47% (1985)

60% (2004)

50% (1980)

56% (1991)

49% (1995)

60% (1994)

60% (1978)

68% (1975)

27% (1997)

61% (2000)

0% (2004)

64% (2001)

0% (1977)

68% (1971)

81% (1982)

56% (2001)

32% (1983)

0% (2006)

54% (1997)