61% (2009)

60% (2010)

51% (2010)

62% (2004)

66% (2010)

61% (2005)

54% (1990)

48% (1995)

35% (1995)

53% (2003)

70% (1996)

56% (2004)

49% (1999)

65% (1996)

50% (1990)

43% (2005)

48% (1999)

53% (2005)

58% (1996)

42% (1998)