73% (1993)

59% (1989)

74% (1986)

59% (1994)

59% (1990)

64% (1992)

74% (1994)

65% (2000)

67% (1990)

61% (1994)

59% (1998)

67% (1987)

54% (2001)

64% (1998)

67% (1995)

63% (1992)

63% (1988)

33% (1990)

49% (1991)

74% (1999)