59% (1973)

71% (1997)

64% (1989)

67% (1977)

60% (1975)

65% (1973)

58% (1985)

53% (1990)

0% (1989)

40% (2002)

0% (2009)

79% (1974)

50% (1972)

50% (1987)

0% (1976)

0% (1982)

57% (1988)

0% (1978)

0% (1981)

35% (1997)