71% (1981)

58% (1980)

66% (1994)

62% (1997)

62% (2007)

52% (2005)

46% (1980)

58% (1991)

43% (1970)

53% (1986)

63% (1970)

62% (1979)

50% (1982)

62% (2002)

55% (1966)

44% (1976)

55% (1975)

50% (2017)

53% (1985)

74% (1984)