72% (1993)

60% (1989)

59% (1994)

67% (1995)

59% (1990)

65% (2000)

59% (1998)

74% (1986)

74% (1994)

66% (1995)

54% (2001)

63% (1991)

49% (1997)

67% (1995)

63% (1988)

74% (1999)

58% (1989)

67% (1987)

63% (2001)

67% (1990)