40% (2000)

39% (1997)

28% (1994)

0% (1998)

80% (1994)

60% (1997)

70% (1993)

0% (1988)

80% (1994)

60% (1978)

40% (1996)

72% (1995)

50% (1999)

35% (1994)

0% (1994)

60% (1996)

0% (1994)

0% (1993)

0% (1976)

49% (1998)