80% (1987)

80% (1997)

77% (1997)

80% (1990)

77% (1992)

71% (1984)

76% (1991)

73% (1974)

73% (1989)

55% (1970)

0% (2001)

60% (1982)

62% (1973)

50% (1975)

55% (1975)

42% (1977)

0% (1972)

66% (1974)

0% (1977)

57% (1976)