20% (1998)

0% (2015)

0% (2001)

52% (1977)

67% (1983)

40% (1993)

0% (1991)

64% (2004)

40% (2006)

0% (1970)

0% (1987)

40% (2002)

35% (2000)

67% (1990)

10% (1985)

62% (1984)

64% (1971)

45% (1989)

0% (1988)

0% (1955)