70% (1985)

68% (1993)

60% (2015)

54% (2017)

62% (1967)

57% (2003)

52% (2001)

68% (1973)

69% (2014)

70% (1989)

53% (1995)

64% (2002)

62% (2005)

62% (1958)

58% (1981)

56% (1992)

59% (1997)

74% (1947)

67% (1950)

64% (1990)