51% (1993)

44% (1988)

63% (2001)

51% (1994)

56% (1996)

61% (1988)

61% (1986)

58% (1997)

49% (1990)

50% (1984)

55% (1990)

65% (1986)

53% (1998)

51% (1996)

64% (1985)

55% (2001)

52% (1996)

50% (1987)

0% (1970)

39% (1999)