66% (1999)

53% (2004)

68% (1994)

69% (1995)

68% (2000)

68% (1999)

61% (1996)

66% (1997)

47% (1997)

55% (1988)

0% (1978)

34% (1982)

20% (1997)

57% (1979)

70% (1978)

20% (1980)

62% (1977)

52% (1986)

57% (1996)

50% (1983)