84% (2002)

67% (1997)

68% (1995)

64% (1996)

52% (2001)

58% (1997)

58% (1976)

59% (2003)

59% (1998)

60% (1996)

72% (1995)

54% (1993)

54% (1995)

67% (1993)

71% (1999)

57% (1997)

30% (1996)

62% (1994)

43% (1992)

58% (2001)