73% (1993)

69% (1992)

74% (1986)

60% (1989)

67% (1990)

60% (1990)

59% (1994)

74% (1994)

65% (2000)

63% (1992)

53% (1987)

50% (1990)

67% (1995)

49% (1991)

63% (1991)

59% (1998)

64% (1992)

54% (2001)

67% (1987)

63% (1988)