73% (2011)

72% (2009)

68% (2019)

60% (1976)

53% (1980)

62% (2014)

58% (2009)

60% (1973)

58% (1976)

68% (1999)

55% (1972)

55% (1980)

57% (2008)

34% (2000)

74% (2005)

57% (1995)

35% (1985)

53% (2000)

53% (1955)

56% (1997)