58% (1997)

60% (1993)

80% (1996)

10% (1993)

0% (1987)

0% (1981)

45% (1980)

10% (1987)

0% (1994)

0% (1976)

70% (1992)

0% (2004)

70% (1992)

0% (1992)

0% (1988)

0% (2006)

0% (1988)

0% (2008)

0% (1995)

0% (1989)