70% (1995)

69% (1992)

50% (2008)

58% (2003)

55% (1996)

64% (2003)

25% (2006)

66% (1994)

54% (1981)

60% (1991)

67% (1987)

60% (1998)

0% (1989)

80% (1988)

60% (1982)

0% (1990)

55% (2005)

40% (1999)

33% (2001)

0% (1984)