51% (1977)

44% (1998)

48% (1989)

50% (1992)

60% (1994)

55% (1988)

45% (1989)

54% (1997)

44% (1994)

62% (1988)

48% (2005)

59% (1995)

54% (1988)

59% (1995)

0% (1970)

47% (1993)

45% (1993)

50% (2000)

59% (1998)

52% (1993)