55% (1985)

65% (1988)

58% (1986)

58% (2007)

55% (1996)

65% (1986)

52% (1995)

54% (1994)

65% (1985)

66% (1990)

63% (2001)

66% (1985)

55% (2001)

60% (1989)

63% (1988)

62% (1986)

51% (2007)

55% (1987)

61% (1988)

41% (1984)