70% (1987)

66% (1998)

57% (1992)

61% (1997)

59% (2005)

57% (1998)

67% (2000)

54% (1991)

60% (1999)

41% (2004)

58% (1999)

57% (2007)

53% (2003)

65% (1986)

59% (1999)

65% (1998)

51% (1999)

51% (1999)

50% (1991)

63% (1992)