60% (2003)

43% (1992)

50% (2002)

59% (2001)

58% (1995)

50% (1992)

82% (2003)

77% (2002)

54% (2000)

58% (2000)

55% (1995)

60% (2001)

70% (1994)

67% (2002)

69% (1998)

55% (2003)

58% (2009)

0% (1970)

50% (1999)

47% (2005)