63% (2002)

56% (1992)

57% (2004)

60% (1986)

64% (1993)

57% (1993)

55% (2001)

55% (2002)

53% (2004)

65% (1999)

64% (1999)

60% (1994)

53% (1994)

54% (1995)

62% (1985)

71% (1992)

57% (1993)

46% (1998)

64% (1991)

60% (1987)