51% (2000)

65% (2008)

60% (1990)

72% (1976)

66% (1992)

63% (2016)

65% (1994)

61% (2012)

63% (1997)

58% (1984)

61% (2017)

61% (1982)

52% (2002)

68% (1997)

66% (2006)

58% (1983)

73% (2002)

72% (1992)

74% (1969)

66% (1987)