55% (2006)

60% (1977)

52% (1990)

77% (2001)

55% (1978)

47% (1996)

0% (1994)

20% (1984)

82% (1973)

50% (1976)

55% (1980)

40% (1969)

0% (1976)

60% (2004)

48% (1974)

57% (1999)

30% (1981)

0% (1975)

0% (1980)

80% (1999)