60% (2001)

57% (2005)

67% (2001)

61% (2005)

49% (2006)

52% (2005)

0% (1980)

0% (1990)

70% (1997)

0% (1988)

8% (1982)

58% (1975)

58% (1984)

40% (1986)

0% (1993)

0% (1984)

0% (1969)

0% (1992)