51% (1990)

64% (1988)

63% (2002)

65% (1999)

59% (2001)

45% (1998)

58% (1993)

62% (1985)

43% (2001)

53% (1988)

52% (1994)

53% (2003)

58% (1997)

62% (1989)

64% (1988)

65% (1999)

62% (1990)

72% (1992)

51% (1992)

62% (1989)