65% (2004)

62% (2007)

56% (1990)

72% (1992)

71% (1989)

68% (2004)

58% (1999)

57% (1998)

67% (2003)

68% (2003)

54% (1991)

59% (1996)

51% (1999)

40% (1997)

62% (1995)

40% (1992)

38% (1989)

0% (1999)