71% (1975)

85% (2004)

73% (1991)

66% (2012)

50% (1980)

65% (1992)

62% (1982)

79% (2015)

78% (1969)

62% (1999)

65% (1976)

66% (1997)

73% (1981)

68% (1967)

70% (1976)

70% (2000)

71% (2005)

53% (2003)

65% (1997)

78% (1995)