64% (1996)

69% (2005)

71% (2010)

61% (1970)

44% (1947)

62% (1980)

74% (1983)

73% (2004)

67% (1968)

45% (1985)

74% (2001)

66% (2016)

55% (1979)

62% (1953)

30% (2001)

48% (2013)

71% (1990)

44% (1999)

55% (2011)

0% (2018)