47% (2007)

40% (1997)

35% (2005)

46% (2006)

42% (2008)

35% (1989)

38% (1989)

48% (1990)

49% (1990)

64% (2005)

50% (1995)

27% (1991)

50% (1990)

34% (1990)

40% (1994)

47% (1993)

60% (1990)