58% (1981)

65% (1989)

72% (1986)

86% (1990)

50% (1980)

36% (1995)

55% (1980)

0% (1979)

60% (1991)

48% (1977)

54% (1977)

50% (1980)

62% (1991)

65% (1978)

41% (1998)

60% (1982)

90% (1999)

52% (2003)

49% (1975)

55% (1978)