68% (1995)

66% (1986)

51% (2008)

55% (1980)

54% (1982)

42% (1993)

59% (1992)

53% (1991)

51% (1993)

10% (1999)

63% (1989)

72% (1990)

66% (1984)

51% (1994)

30% (1981)

44% (1995)

0% (1987)

45% (1984)

58% (1981)

57% (1991)