63% (1993)

33% (1978)

60% (1985)

63% (1986)

63% (1986)

65% (2001)

52% (1987)

59% (1983)

61% (1999)

56% (1997)

56% (1987)

67% (1991)

60% (2006)

58% (1989)

71% (1991)

73% (1991)

73% (2003)

66% (1992)

66% (1992)

71% (1992)