67% (2002)

49% (2006)

38% (2002)

51% (2000)

41% (1998)

53% (2004)

47% (1998)

48% (1999)

53% (2001)

48% (1997)

47% (2002)

42% (2001)

35% (1999)

32% (1997)

41% (2001)

55% (2004)