61% (1993)

44% (1995)

51% (2007)

64% (1994)

72% (1984)

48% (1994)

59% (1998)

58% (1986)

50% (1991)

49% (1998)

64% (1990)

55% (1994)

60% (1988)

67% (1986)

66% (1985)

70% (1992)

55% (1984)

63% (1988)

66% (1990)

66% (1984)