71% (1981)

59% (1980)

62% (1997)

66% (1994)

62% (2007)

59% (1991)

51% (1982)

50% (1976)

64% (1970)

65% (2002)

61% (1987)

53% (1986)

48% (1976)

46% (1980)

75% (1984)

53% (2005)

62% (1979)

50% (2017)

57% (1974)

0% (1975)