48% (2007)

63% (1986)

65% (2011)

61% (1982)

60% (1984)

62% (1980)

59% (1988)

55% (1984)

64% (1990)

54% (1980)

60% (1991)

56% (1982)

66% (1992)

65% (1987)

43% (1981)

58% (1995)

59% (1984)

12% (1980)