56% (2006)

74% (2007)

61% (1999)

56% (1993)

62% (1996)

65% (1995)

48% (2005)

56% (1997)

43% (1995)

38% (2008)

49% (2006)

49% (1995)

49% (1994)

48% (2008)

60% (1994)

57% (1997)

38% (2004)

47% (1991)

53% (1989)

56% (2002)