60% (1987)

63% (1981)

63% (1984)

60% (1982)

50% (1995)

52% (1992)

50% (2000)

45% (1997)

49% (1996)

32% (2004)

37% (1984)

60% (1991)

41% (2006)

15% (2000)

57% (1958)

70% (1989)

0% (1957)

0% (1947)

60% (1977)

0% (1967)