75% (2001)

76% (2005)

74% (2018)

71% (1978)

73% (1988)

63% (2006)

78% (1991)

63% (1950)

63% (1958)

66% (2012)

71% (2016)

70% (1957)

48% (2004)

78% (2015)

72% (1979)

68% (1979)

83% (1993)

55% (2003)

68% (2001)

64% (1997)