66% (2001)

59% (2001)

57% (2005)

61% (2005)

48% (2006)

52% (2005)

58% (1984)

70% (1997)

40% (1986)

0% (1990)

0% (1980)

58% (1975)

8% (1982)

0% (1969)

0% (1984)

0% (1993)

0% (1988)

0% (1992)