59% (1987)

49% (1986)

52% (1992)

43% (1997)

55% (1996)

51% (1990)

57% (1997)

55% (1998)

60% (1999)

60% (1994)

50% (1986)

56% (1996)

50% (1988)

56% (1995)

43% (2002)

57% (1981)

41% (1987)

49% (1987)

60% (1987)

43% (1987)