71% (1995)

53% (2004)

79% (2009)

72% (2020)

71% (2016)

67% (1999)

68% (2000)

68% (1981)

66% (1997)

68% (1999)

57% (1996)

69% (1988)

66% (1994)

67% (2009)

62% (1980)

66% (1982)

74% (2001)

63% (2003)

63% (2004)

57% (2006)