68% (1983)

65% (1994)

73% (2007)

69% (1993)

54% (1988)

52% (2012)

67% (1963)

51% (2007)

68% (2010)

69% (1997)

74% (2021)

60% (1986)

57% (2011)

62% (1972)

49% (1994)

60% (1993)

56% (2011)

55% (2000)

61% (2019)

64% (1970)