62% (1974)

38% (1988)

54% (1988)

58% (1984)

62% (1980)

45% (1990)

59% (1981)

41% (1982)

56% (1981)

62% (1988)

0% (1968)

55% (1991)

44% (1988)

46% (1987)

0% (1991)

56% (1980)

54% (1993)

61% (1994)

62% (1980)

75% (1995)