0% (1975)

75% (1991)

71% (1997)

71% (1984)

60% (1985)

57% (1999)

65% (2000)

71% (1982)

43% (1986)

54% (1987)

30% (2000)

0% (2001)

52% (1988)

0% (1999)

64% (1997)

61% (1972)

10% (1965)

45% (1970)

57% (1975)

44% (1992)