56% (1993)

59% (1987)

41% (1987)

60% (1994)

51% (1990)

56% (1996)

55% (1998)

51% (1986)

55% (1996)

50% (1988)

57% (1997)

49% (1986)

60% (1999)

49% (1987)

43% (1997)

60% (1987)

43% (2002)

43% (1987)

57% (1981)

56% (1995)