59% (1972)

72% (1980)

50% (1997)

64% (1987)

55% (1985)

48% (1981)

58% (1983)

50% (1976)

57% (1983)

48% (1969)

45% (1988)

42% (2007)

48% (1970)

58% (1971)

59% (1974)

66% (1984)

0% (1987)

50% (1981)

53% (1975)

0% (1985)