59% (1980)

70% (1981)

66% (1994)

62% (2007)

62% (1997)

62% (1979)

64% (1970)

59% (1991)

61% (1987)

46% (1980)

51% (1982)

54% (1985)

53% (2005)

53% (1986)

55% (1966)

75% (1984)

43% (1970)

57% (1974)

48% (1976)

50% (2017)