68% (1995)

54% (1982)

55% (1980)

66% (1986)

51% (1994)

51% (1993)

51% (2008)

66% (1984)

42% (1993)

44% (1995)

63% (1989)

72% (1990)

71% (1996)

59% (1992)

0% (1975)

46% (1999)

30% (1981)

10% (1996)

58% (1981)

46% (1980)