56% (1996)

60% (1994)

55% (1989)

59% (1987)

51% (1986)

55% (1998)

61% (1999)

49% (1986)

55% (1996)

49% (2004)

57% (1997)

50% (1988)

60% (1987)

60% (1999)

43% (2002)

56% (1981)

49% (1987)

43% (1987)

45% (1995)

43% (1997)