79% (1973)

62% (1970)

77% (2022)

74% (2021)

65% (2020)

58% (2019)

51% (2017)

62% (2017)

60% (2015)

57% (2015)

62% (2013)

45% (2010)

72% (1999)

71% (1956)

52% (2008)

60% (1982)

72% (2005)

59% (1991)

71% (2004)

56% (2005)