64% (1995)

47% (1999)

70% (1996)

65% (1986)

66% (1984)

51% (1994)

71% (1990)

41% (1996)

60% (1999)

42% (1993)

65% (1995)

63% (1976)

0% (1992)

0% (1975)

59% (1992)

35% (1996)

30% (1981)

40% (1982)

70% (1980)

55% (1982)