84% (2002)

67% (1997)

68% (1995)

59% (2003)

58% (1976)

64% (1996)

58% (1997)

59% (1998)

60% (1996)

54% (1993)

52% (2001)

57% (1997)

70% (2003)

43% (1992)

72% (1995)

67% (1993)

62% (1994)

54% (1995)

30% (1996)

58% (2001)