58% (1978)

55% (1976)

63% (1971)

59% (2015)

47% (1980)

66% (1978)

60% (2015)

75% (1990)

64% (1985)

59% (2006)

54% (1983)

59% (2014)

58% (1971)

60% (1998)

62% (1979)

60% (1990)

61% (1981)

59% (1989)

53% (1974)

42% (2009)