64% (1960)

62% (2008)

72% (2015)

65% (1983)

58% (1997)

61% (1985)

59% (2004)

69% (2006)

72% (2005)

67% (2007)

59% (2002)

75% (2019)

54% (2001)

64% (2010)

63% (2002)

59% (2005)

70% (1990)

64% (2004)

53% (1988)

72% (2016)