80% (1980)

75% (1986)

69% (1987)

66% (1993)

68% (1981)

57% (1989)

61% (1995)

69% (1982)

59% (1992)

62% (2005)

68% (1983)

52% (1986)

72% (1987)

56% (1991)

68% (1982)

56% (1980)

78% (2011)

65% (1984)

35% (1978)

68% (2015)