68% (2002)

53% (2001)

51% (2000)

49% (2006)

38% (2002)

49% (1999)

53% (2004)

45% (1998)

48% (2002)

48% (1998)

48% (1997)

38% (1997)

42% (2001)

35% (1999)

55% (2004)

41% (2001)