73% (1993)

60% (1989)

59% (1994)

67% (1990)

74% (1994)

59% (1990)

65% (2000)

54% (2001)

74% (1986)

67% (1995)

51% (2002)

59% (1998)

63% (1992)

67% (1995)

65% (1995)

67% (1987)

61% (1987)

63% (1991)

53% (1988)

67% (1995)