51% (1973)

38% (2005)

54% (1997)

79% (1981)

66% (1994)

72% (1985)

34% (1991)

35% (1987)

61% (2004)

63% (1971)

57% (1996)

50% (1999)

50% (1979)

90% (1982)

60% (1977)

58% (1993)

35% (1987)

0% (1979)

64% (1987)

51% (1979)