57% (2015)

58% (2014)

65% (2013)

58% (2012)

69% (1986)

64% (2007)

68% (1953)

54% (1989)

69% (1998)

50% (1993)

56% (1995)

61% (2004)

68% (2006)

57% (2006)

59% (1983)

55% (2006)

63% (1997)

56% (1998)

49% (1999)

60% (2020)