65% (1971)

80% (1990)

71% (1993)

81% (1978)

79% (2002)

81% (1999)

82% (2015)

66% (1996)

73% (1999)

73% (2014)

80% (1990)

74% (2015)

81% (1975)

90% (1994)

83% (1985)

89% (1999)

73% (2011)

86% (2004)

73% (1997)

60% (1974)