68% (1981)

78% (2009)

69% (1995)

68% (1988)

71% (1995)

67% (1999)

53% (2004)

71% (2016)

69% (1999)

72% (2020)

68% (2000)

66% (2009)

66% (1997)

62% (1980)

57% (2006)

68% (1994)

59% (2002)

64% (1982)

74% (2001)

57% (1996)