68% (1976)

70% (2012)

72% (1985)

63% (2011)

69% (1986)

62% (2010)

68% (1974)

66% (1983)

75% (2006)

67% (1997)

59% (1990)

70% (1970)

61% (1978)

65% (1972)

75% (1993)

60% (1982)

63% (1988)

60% (2021)

55% (2018)

62% (2002)