59% (1987)

41% (1987)

56% (1996)

60% (1994)

51% (1990)

57% (1997)

55% (1998)

55% (1996)

49% (1986)

49% (2004)

51% (1986)

60% (1987)

56% (1981)

43% (1997)

43% (1987)

60% (1999)

43% (2002)

45% (1995)

49% (1987)

45% (1995)