74% (1976)

64% (1974)

71% (1978)

56% (2000)

59% (1996)

65% (1982)

65% (1986)

71% (1977)

68% (2016)

52% (1972)

69% (1993)

67% (2003)

64% (2012)

48% (1973)

62% (1999)

58% (1985)

34% (1995)

48% (2006)

58% (1991)

50% (1991)