60% (2001)

66% (2001)

55% (2005)

48% (2006)

40% (1986)

49% (2005)

60% (2005)

58% (1975)

0% (1980)

0% (1990)

0% (1969)

70% (1997)

0% (1984)

8% (1982)

0% (1993)

0% (1988)

58% (1984)