74% (1976)

65% (1974)

72% (1977)

59% (1996)

56% (2000)

71% (1978)

52% (1972)

65% (1982)

66% (2003)

65% (1986)

49% (2006)

62% (1999)

69% (1993)

68% (2016)

63% (2012)

58% (1991)

47% (1975)

25% (2009)

68% (1982)

34% (1995)